KR102625392B1 - Polarization divisional double scanning holography system with tilt angle for transmissive object - Google Patents

Abstract

The present invention relates to a polarization splitting double scanning holography system using angular tilt for a transmitting body. The polarization splitting double scanning holography system for a transmitting body according to the present invention modulates the phase of the first beam split from the light source, converts it into a first curvature beam through the first beam curvature generator, and converts the second beam into a second beam curvature. a scan beam generator that converts the beam into a second curved beam through the generator and then forms a scan beam by interfering with the first and second curved beams; a scan beam splitter that splits the scan beam into an s-polarized beam and a p-polarized beam and emits them at different angles; A scan unit that receives a scan beam consisting of two polarized beams emitted at different angles from the scan beam splitter and projects it onto a transmitting object, and controls the scanning position of the scan beam with respect to the transmitting object in the horizontal and vertical directions; A scan beam transmission unit made of at least one lens and disposed between the scan unit and the transmitting body to transmit a scan beam consisting of two polarized beams traveling at different angles to the transmitting body; A light detection unit that separates and detects an s-polarized beam and a p-polarized beam from the beam that has passed through the transmitting material; and a signal processing unit that processes signals of the separately detected s-polarized beam and p-polarized beam to generate a hologram for the transmitting body.
According to the present invention, it is possible to obtain a hologram for a transparent object at ultra-high speed, faster than the scanning speed of a scan mirror.

Description

Polarization divisional double scanning holography system with tilt angle for transmissive object}

The present invention relates to a polarization-splitting double scanning holography system using an angular tilt to a transmitting body. More specifically, to a polarization-splitting double scanning holography system using an angular inclination to a transmitting body that can implement a scanning hologram for an object at ultra-high speed. It's about.

A conventional optical scanning hologram system uses an interferometer to form a beam pattern with a spatial distribution of a Fresnel zone plate, projects the formed beam pattern onto an object, and condenses the light reflected or transmitted from the object. A hologram of an object is obtained through detection.

However, in this conventional method, there is a problem that the speed of acquiring a hologram is dependent on the scanning speed of the scanning mirror.

Therefore, a new technique that can acquire a hologram of an object faster than the scanning speed of a scanning mirror is required.

The technology behind the present invention is disclosed in Korean Patent No. 1304695 (announced on September 6, 2013).

The purpose of the present invention is to provide a polarization-splitting double scanning holography system using angular inclination for a transparent object that can implement a scanning hologram for a transparent object.

The present invention modulates the phase of the first beam split from the light source, converts it into a first curvature beam through the first beam curvature generator, and converts the second beam into a second curvature beam through the second beam curvature generator, a scan beam generator that forms a scan beam by interfering with the first and second curvature beams; a scan beam splitter that splits the scan beam into an s-polarized beam and a p-polarized beam and emits the two split polarized beams at different angles; A scan beam consisting of two polarized beams emitted at different angles is received from the scan beam splitter and projected onto a transmitting body, and the scanning position of the scan beam with respect to the transmitting body is controlled in the horizontal and vertical directions and transmitted to the transmitting body. a scanning unit for a scan beam transmission unit made of at least one lens, disposed between the scan unit and the transmitting body, and transmitting a scan beam consisting of two polarized beams traveling at different angles to the transmitting body; a light detection unit that separates and detects the s-polarized beam and the p-polarized beam from the beam that has transmitted through the transmitting body; and a signal processing unit that processes signals of the separately detected s-polarized beam and p-polarized beam to generate a hologram for the transmitting body.

In addition, the light detection unit may include: a first concentrator disposed in a direction biased to the optical axis of the beam projected to the transmitting member and concentrating the beam that has transmitted through the transmitting member; a first polarizer that passes only the s-polarized beam component in the spatially integrated beam through the first concentrator; a first photodetector that detects the s-polarized beam that has passed through the first polarizer; a second concentrator disposed in a direction biased to the optical axis of the beam projected to the transmitting body and at a different position from the first concentrator, and concentrating the beam that has transmitted through the transmitting body; a second polarizer that passes only the p-polarized beam component of the spatially integrated beam through the second concentrator; And it may include a second photodetector that detects the p-polarized beam that has passed through the second polarizer.

In addition, the light detection unit may include: a first light splitter disposed on the optical axis of the light projected to the transmissive body and receiving the beam passing through the transmissive body and reflecting it to the outside; a second light splitter that receives the light reflected from the first light splitter and transmits the p-polarized beam component and reflects the s-polarized beam component of the incident beam; a first concentrator that focuses the s-polarized beam component reflected by the second light splitter; a second concentrator for concentrating the p-polarized beam component transmitted from the second light splitter; a first photodetector that detects a spatially integrated beam through the first concentrator; And it may include a second photodetector that detects a spatially integrated beam through the second concentrator.

In addition, the light detection unit may include: a first light splitter disposed on the optical axis of the light projected to the transmissive body and receiving the beam passing through the transmissive body and reflecting it to the outside; a second light splitter that receives the light reflected from the first light splitter, transmits part of the incident beam, and reflects part of the incident beam; a first polarizer that receives the beam reflected from the second light splitter and passes only the s-polarized beam component; a second polarizer that receives the beam transmitted from the second light splitter and passes only the p-polarized beam component; a first concentrator that focuses the s-polarized beam component that has passed through the first polarizer; a second concentrator that focuses the p-polarized beam component that has passed through the second polarizer; a first photodetector that detects a spatially integrated beam through the first concentrator; And it may include a second photodetector that detects a spatially integrated beam through the second concentrator.

Additionally, the signal processing unit may include a first signal processing unit that processes a signal of the s-polarized beam detected by the first photodetector; a second signal processor that processes the signal of the p-polarized beam detected by the second photodetector; and a cross-array signal processor that generates a hologram for the transmitting object by synthesizing the hologram signal processed in the first signal processor and the hologram signal processed in the second signal processor by alternating the lines one by one. .

In addition, the scan beam splitter is made of an anisotropic optical material, and separates the scan beam incident through the first side into an s-polarized beam and a p-polarized beam with polarizations orthogonal to each other and emits them in parallel through the second side. Beam displacer; and a wedge prism installed on the beam path of one of the s-polarized beam and the p-polarized beam emitted through the second surface to change the traveling angle of the beam so that the two beams are emitted at different angles. It can be included.

In addition, the scan beam splitter is installed on the path of the shorter p-polarized beam among the paths of the s-polarized beam and the p-polarized beam emitted through the second surface, and is made of the same material as the beam displacer. It may further include an optical path difference correction unit that compensates for the difference in optical path length between the emitted s-polarized beam and the p-polarized beam.

In addition, the scan beam splitter is composed of a combination of two triangular prisms whose crystal axes are perpendicular to each other and made of different materials, and the scan beam incident through the first surface is transmitted parallel to the scan beam at the boundary surface of the two triangular prisms. A polarizing prism having a Rochon prism or Senarmont prism structure that separates the first polarized beam into a first polarized beam and a second polarized beam that travels at a set angle and emits them through a second surface. Including, if the first polarized beam is an s-polarized beam, the second polarized beam may be a p-polarized beam, and if the first polarized beam is a p-polarized beam, the second polarized beam may be an s-polarized beam.

In addition, the polarizing prism is installed in a state rotated by a set angle based on the center of the boundary surface, and the set angle is the angle between the travel directions of the first polarization beam and the second polarization beam separately emitted from the center of the boundary surface. It may be θ/2, which is half of the difference (θ).

In addition, the scan beam splitter includes first and second mirrors that are sequentially installed on the path of the second polarized beam emitted through the second surface to change the beam path, and a first and second mirrors that are sequentially installed on the path of the second polarized beam emitted through the second surface. 1. It further includes an angle adjusting unit including third and fourth mirrors that are sequentially installed on the path of the polarizing beam to change the beam path and are installed symmetrically to the first and second mirrors, wherein the angle adjusting unit By adjusting the angle of each mirror, the travel directions of the second polarized beam that has passed through the second mirror and the first polarized beam that has passed through the fourth mirror can be adjusted to different angles.

In addition, the scan beam splitter is composed of a combination of two triangular prisms whose crystal axes are perpendicular to each other and made of different materials, and the scan beam incident through the first surface is divided into two triangular prisms at the boundary surface of the two triangular prisms in the direction of the scan beam. It may include a polarizing prism of a Wollaston prism structure that separates the s-polarized beam and the p-polarized beam, which proceed symmetrically to each other at a set angle, and emits them through the second surface.

In addition, the scan beam splitter includes first and second mirrors that are sequentially installed on the path of the p-polarized beam emitted through the second surface to change the beam path, and s emitted through the second surface. -It further comprises an angle adjusting unit including third and fourth mirrors that are sequentially installed on the path of the polarizing beam to change the beam path and are installed symmetrically with the first and second mirrors, and the angle adjusted by the angle adjusting unit By adjusting the angle of the mirror, the travel directions of the p-polarized beam that has passed through the second mirror and the s-polarized beam that has passed through the fourth mirror can be adjusted to different angles.

In addition, the scan beam splitter includes a first polarizing beam splitter that reflects the s-polarized beam component and transmits the p-polarized beam component from the incident scan beam; first and second mirrors sequentially installed on the path of the s-polarized beam reflected from the first polarizing beam splitter to change the beam path by 90 degrees; third to fifth mirrors sequentially installed on the path of the p-polarized beam transmitted from the first polarizing beam splitter to change the beam path by 90 degrees; a sixth mirror whose angle is adjustable and which reflects the angle of the p-polarized beam that has passed through the fifth mirror at an angle greater than 90 degrees; and a second polarized beam that receives the s-polarized beam that has passed through the second mirror and the p-polarized beam that has passed through the sixth mirror through the first and second sides, respectively, and outputs them at different angles through the third side. May include a splitter.

In addition, the scan beam splitter includes a first polarizing beam splitter that reflects the s-polarized beam component and transmits the p-polarized beam component from the incident scan beam; first and second mirrors sequentially installed on the path of the s-polarized beam reflected from the first polarizing beam splitter to change the beam path by 90 degrees; third to sixth mirrors sequentially installed on the path of the p-polarized beam transmitted from the first polarizing beam splitter to change the beam path by 90 degrees; a wedge prism that receives the beam reflected from the sixth mirror and outputs the beam by changing its propagation angle; And a second polarizing beam splitter that receives the s-polarized beam that has passed through the second mirror and the p-polarized beam that has passed through the wedge prism through the first and second sides, respectively, and outputs them at different angles through the third side. may include.

In addition, the scan beam splitter includes a beam splitter that transmits part of the incident scan beam and reflects part of it; first and second mirrors sequentially installed on the path of the beam reflected from the beam splitter to change the beam path by 90 degrees; third to fifth mirrors sequentially installed on the path of the beam transmitted from the beam splitter to change the beam path by 90 degrees; A polarizer disposed on one of the paths of the reflected beam or the transmitted beam of the beam splitter to allow only one polarization component of s-polarization and p-polarization to pass or to create a linearly polarized beam at a specific angle; a sixth mirror whose angle is adjustable and which reflects the angle of the beam passing through the fifth mirror at an angle greater than 90 degrees; And the beam that has passed through the second mirror and the beam that has passed through the sixth mirror are incident on the first and second sides, respectively, and are formed on the third side. It may include a polarizing beam splitter that outputs output at different angles.

In addition, the scan beam splitter includes a beam splitter that transmits part of the incident scan beam and reflects part of it; first and second mirrors sequentially installed on the path of the beam reflected from the beam splitter to change the beam path by 90 degrees; third to sixth mirrors sequentially installed on the path of the beam transmitted from the beam splitter to change the beam path by 90 degrees; A polarizer disposed on one of the paths of the reflected beam or the transmitted beam of the beam splitter to allow only one polarization component of s-polarization and p-polarization to pass or to create a linearly polarized beam at a specific angle; a wedge prism that receives the beam reflected from the sixth mirror and outputs the beam by changing its propagation angle; And it may include a polarizing beam splitter that receives the beam that has passed through the second mirror and the beam that has passed through the wedge prism through the first and second sides, respectively, and outputs them at different angles through the third side.

In addition, the polarization splitting double scanning holography system includes: a first λ/4 wave plate installed between the scan unit and the transmitting body to convert the scan beam into circularly polarized light and project it to the transmitting body; And it may further include a second λ/4 wave plate installed between the transmitting body and the light detection unit to convert the circularly polarized beam back into linearly polarized light and provide it to the light detection unit.

In addition, the scan unit includes a horizontal scan mirror and a vertical scan mirror to control the scanning position of the scan beam with respect to the transmitting object, and can control the incident scan beam in horizontal and vertical directions and transmit it to the transmitting object.

In addition, the scan unit includes a scan mirror that controls the scan beam incident from the scan beam splitter in the horizontal direction and transmits it to the transmissive body so as to control the scanning position of the scan beam with respect to the transmissive body in the horizontal and vertical directions; A translation stage may be included at the rear end of the transparent body to move the transparent material in the vertical direction.

In addition, the scan unit controls the scan beam incident from the scan beam splitter in the horizontal direction to control the scanning position of the scan beam with respect to the transmissive body in the horizontal and vertical directions and transmits it to the transmissive body through spatial modulation (spatial modulation). modulation) may include a scanner and a translation stage that moves the transparent material in the vertical direction at the rear end of the transparent material.

In addition, the scan unit includes a vertical scanner and a horizontal scanner for controlling the scanning position of the scan beam with respect to the transmitting body in the horizontal and vertical directions, and controls the scan beam incident from the scan beam splitter in the horizontal direction. It may include a horizontal spatial modulation scanner that controls the scan beam in the vertical direction and transmits it to the transmitting body, and a vertical spatial modulation scanner that controls the scan beam in the vertical direction and transmits it to the transmitting body.

According to the present invention, it is possible to obtain a hologram for a transparent object at ultra-high speed, faster than the scanning speed of a scan mirror.

Figure 1 is a diagram showing the configuration of a polarization-splitting double scanning holography system for a transmissive material according to a first embodiment of the present invention.
Figure 2a is a diagram showing the configuration of a polarization-splitting double scanning holography system for a transmissive material according to a second embodiment of the present invention.
FIG. 2B is a diagram showing a modified example of FIG. 2A.
Figure 3 is a diagram showing the configuration of a polarization-splitting double scanning holography system for a transmissive material according to a third embodiment of the present invention.
Figure 4a is a diagram showing the configuration of a polarization-splitting double scanning holography system for a transmissive material according to a fourth embodiment of the present invention.
FIG. 4B is a diagram showing a modified example of FIG. 4A.
FIGS. 5A to 5H are diagrams illustrating various embodiments of the scan beam splitter shown in FIG. 1.
Figure 6 is a diagram explaining the operation of a signal processing unit according to an embodiment of the present invention.
Figure 7 is a diagram explaining the operating principle of a spatial modulation scanner.
Figure 8 is a diagram explaining the operating principle of the horizontal and vertical spatial modulation scanner.
Figure 9 is a diagram illustrating the configuration of a scan beam transmission unit according to an embodiment of the present invention.

Then, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected," but also the case where it is "electrically connected" with another element in between. . Additionally, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

The present invention relates to a polarization-splitting double scanning holography system using angle tilt for a transmissive object, and proposes a polarization-splitting double scanning holography system for acquiring a hologram for a transmissive object (hereinafter referred to as a transmissive object) at high speed. do.

In the present invention, the beam generated by the scan beam generator is divided into an s-polarized beam and a p-polarized beam, and then projected at different angles to a transmitting object, which is the object to be scanned, and the beam passing through the transmitting object is condensed. We propose an optical system structure that implements a hologram for a transmitting object at high speed by processing the s-polarized beam and p-polarized beam that are separately detected by the light detector after being transmitted to the light detector.

Hereinafter, the polarization splitting double scanning holography system for a transmissive material according to an embodiment of the present invention will be described in more detail with reference to the drawings.

1 to 4 are diagrams showing the configuration of a polarization-splitting double scanning holography system for a transmissive material according to the first to fourth embodiments of the present invention.

First, as shown in FIG. 1, the polarization splitting double scanning holography system 100 for a transmitting body according to the first embodiment of the present invention largely includes a scan beam generator 110, a scan beam splitter 120, and a scan unit ( 130), a scan beam transmission unit 135, a light detection unit 140, and a signal processing unit 150. This basic structure also applies to the remaining second to fourth embodiments.

First, the scan beam generator 110 converts the first beam of the first and second beams split from the light source into a first curvature beam through the first lens 115 by frequency shifting, and converts the second beam into a second beam. After being converted into a second curvature beam through the lens 116, the first and second curvature beams are interfered to form a scan beam.

The scan beam generator 110 uses a mark-gender interferometer structure that splits a light source into first and second beams to generate first and second curved beams, and then combines the two generated beams again.

The scan beam generator 110 includes a first mirror (M1), a light splitter 111, a frequency shift means 112, second and third mirrors (M2, M3), and first and second beam curvature generators ( N1, N2), and an interference means 117, and may further include a light source.

The light source is the part that generates electromagnetic waves. The light source may include various means such as a laser generator capable of generating electromagnetic waves, a light emitting diode (LED), and a beam with low coherence such as helogen light with a short coherence length. Below, the light source implemented as a laser generator is taken as a representative example.

The beam output from the light source is transmitted to the first mirror (M1) and then reflected and input to the light splitter 111.

The light splitter 111 separates the incident beam into a first beam and a second beam, transmits the first beam to the phase modulation means 112 (acoustic-optical modulator), and transfers the second beam to the third mirror M3. Pass it to That is, the beam following the path of the first beam from the optical splitter 111 is transmitted to the phase modulation means 112, and the beam following the path of the second beam is transmitted to the third mirror M3.

Here, the optical splitter 111 may be composed of an optical fiber coupler, a beam splitter, a geometric phase lens, etc., and transmits the beam to the outside by guiding the free space. It can be implemented in this way. Here, when using a means that can split the beam on the co-axis (in-line), such as a geometric phase lens, it can be split into a first beam and a second beam on the co-axis. Hereinafter, it is assumed that each optical splitter is implemented as a beam splitter.

The phase modulation means 112 shifts the frequency of the first beam and then transmits it to the second mirror (M2). The frequency shifting means, that is, the phase modulating means, can shift the frequency of the first beam by Ω using a frequency generated by a function generator (not shown) and transmit it to the second mirror (M2). Here, the phase modulator may be implemented with various types of modulators that modulate the phase of light according to an electric signal, including an acousto-optic modulator and an electro-optic modulator.

The first beam reflected from the second mirror (M2) is transmitted to the first beam curvature generator (N1). The second beam reflected from the third mirror (M3) is transmitted to the second beam curvature generator (N2). The beam expander can be implemented as a collimator.

The first and second beam curvature generators N1 and N2 receive each beam and generate an enlarged beam having a curvature between negative and positive curvatures, including a collimated beam.

A specific example of implementation of the first beam curvature generator (N1) includes a first lens 113 that converts the first beam reflected from the second mirror (M2) into a spherical wave, and a beam that receives the spherical wave and has a curvature (first curvature As a beam expander having a second lens 115 that generates a beam, the curvature of the beam can be adjusted by adjusting the distance between the first lens 113 and the second lens 115. A specific example of the second beam curvature generator (N2) includes a third lens 114 that converts the second beam reflected from the third mirror (M3) into a spherical wave, and a beam with a curvature (second curvature) that receives the spherical wave. As a beam expander having a fourth lens 116 that generates a beam, the curvature of the beam can be adjusted by adjusting the distance between the third lens 114 and the fourth lens 116.

The first beam curvature generator (N1) converts the first beam into a first curvature beam and transmits it to the interference means (117). That is, the first beam curvature generator N1 generates a second curvature beam by modulating the spatial distribution of the first beam.

The second beam curvature generator (N2) converts the second beam into a first curvature beam and transmits it to the interference means (117). That is, the second beam curvature generator N2 generates the second curvature beam by modulating the spatial distribution of the second beam.

The generated first and second curvature beams interfere with each other while passing through the interference means 117 and are transmitted to the scanning unit 130. The interference means 117 may be implemented as a beam splitter.

The interference means 117 generates a first beam (first curved beam) that has passed through the first beam curvature generator (N1) and a second beam (second curved beam) that has passed through the second beam curvature generator (N2). They overlap and interfere with each other to form scan beams with an interference pattern of a Fresnel zone pattern. The Fresnel annular pattern may represent a beam pattern generated by interference between a first and second curved beam whose curvatures are not completely the same.

In this way, the scan beam generator 110 converts the first beam and the second beam separated from the light source into the first and second curved beams and overlaps them through the interference means 117 to form a scan beam. The scan beam is transmitted to the scan beam splitter 120.

Here, the scan beam generated by the scan beam generator 110 is either linearly polarized at 45 degrees with respect to the horizontal direction of the scan beam splitter 120 (the direction in which the beam is incident on the scan beam splitter in FIG. 1) or is not linearly polarized. Preferably it is a beam.

For this purpose, the laser generates a beam linearly polarized at 45 degrees with respect to the horizontal direction of the scan beam splitter 120, or the laser outputs a linearly polarized beam in a random direction and the linearly polarized direction of the output laser beam is changed using a wave plate. ), a beam polarized at 45 degrees with respect to the horizontal direction of the scan beam splitter 120 can be generated. Of course, when a circularly polarized beam is generated from a laser beam, it can be changed to a linearly polarized beam using a wave plate.

The scan beam splitter 120 splits the incident scan beam into an s-polarized beam and a p-polarized beam and emits the two split polarized beams toward the scan unit 130 at different angles. That is, the scan beam splitter 120 divides the scan beam received from the scan beam generator 110 into two scan beams (first scan beam: s-polarized beam, second scan beam: p-polarized beam) according to polarization. ) and emits two beams at different angles to deliver them to the scan unit 130.

In this way, the scan beam splitter 120 spatially separates the beam received from the scan beam generator 110 into a p-polarized beam and an s-polarized beam, and does not emit the two separated beams parallel to each other but at different angles. It is released as

This scan beam splitter 120 has the function of splitting the scan beam into an s-polarized beam and a p-polarized beam, the function of adjusting the optical path length between the two split beams to be the same, and the traveling direction of the two split beams. It can be implemented including a function that creates different angles.

The first function can be implemented using a beam displacer, polarizing prism, or polarized beam splitter (PBS), and the second and third functions can be implemented using a wedge prism or a plurality of mirrors. It can be implemented using a combination or a combination of a plurality of mirrors and a polarizing beam splitter (PBS). This will be explained in detail through FIGS. 5A to 5H below.

Next, the configuration of the scan beam splitter shown in FIG. 1 will be described in more detail. The scan beam splitter 120 may be implemented in various structures as follows.

FIGS. 5A to 5H are diagrams illustrating various embodiments of the scan beam splitter shown in FIG. 1.

First, Figure 5a shows the first embodiment of the scan beam splitter, where the scan beam splitter 120-1 includes a beam displacer 121a corresponding to a polarization splitter and a wedge prism 122. ) and may further include an optical path difference correction unit 123 for correcting the optical path difference between the two divided polarization beams as shown in the bottom figure of FIG. 5A. Here, the top two pictures of FIG. 5A show different installation positions of the wedge prism 122, and the last picture shows the addition of the optical path difference correction unit 123.

The beam displacer 121a separates the scan beam incident through the first side into an s-polarized beam and a p-polarized beam with polarizations orthogonal to each other, and emits them in parallel through the second side. At this time, the beam displacer 121a is made of an anisotropic optical material. Calcite, YVO4, α-BBO, TeO ₂ , etc. may be used as the anisotropic optical material.

In FIG. 5A, among the two polarized beams emitted, a ray whose polarization oscillates in the same direction as the optical axis of the beam displacer 121a (see optical axis indication on the upper surface) is called an ordinary ray, and is perpendicular to the optical axis. A ray whose polarization oscillates in the same direction is called an extra-ordinary ray.

In the case of FIG. 5A, the p-polarized beam emitted from the beam displacer 121a corresponds to a normal ray parallel to the optical axis of the beam displacer 121a, and the s-polarized beam corresponds to an abnormal ray perpendicular to the optical axis.

In this way, when the beam displacer 121a is implemented using an optical material with an anisotropic material crystal structure, it has a birefringent characteristic in which the refractive index changes depending on polarization, so that a beam polarized at 45 degrees or unpolarized is incident and has a phase of 90 degrees. It can be split into two linearly polarized beams (s-polarized beam, p-polarized beam) with a difference.

A wedge prism 122 is disposed at the rear end of the beam displacer 121a. In the first picture of FIG. 5A, the wedge prism 122 is installed on the path of the p-polarized beam, and in the second picture, the wedge prism 122 is installed on the path of the s-polarized beam.

In this way, the wedge prism 122 is installed on the beam path of one of the s-polarized beam and the p-polarized beam emitted through the second surface of the beam displacer 121a to change the traveling angle of the beam. Accordingly, the two beams are emitted at different angles.

The wedge prism 122 may be made of a glass material, has a wedge shape and has an inclined surface formed on the rear, and can deflect the beam output to the rear. In the first picture of FIG. 5A, the p-polarized beam is polarized among the two beams output in parallel from the beam displacer 121a, and in the second picture, the s-polarized beam is polarized.

Here, an optical path difference occurs between the two polarized beams separately emitted from the beam displacer 121a, and the optical path difference correction unit 123 may be used to correct this. At this time, an optical material under the same conditions as the beam displacer 121a can be installed at the position where the normal ray is emitted, and the optical path difference between the two beams can be corrected using this.

Specifically, the optical path difference correction unit 123 is installed on the path of the shorter p-polarized beam among the paths of the s-polarized beam and the p-polarized beam emitted through the second surface of the beam displacer 121a. , It is implemented with the same optical material as the beam displacer 121a, and can compensate for the difference in optical path length between the emitted s-polarized beam and the p-polarized beam.

Here, by adjusting the thickness of the optical material (optical material) constituting the beam displacer 121a, the emission position (inter-beam spacing) of the s-polarized beam and the p-polarized beam can be adjusted, and through this, the beam displacer 121a It is possible to control the displacement value of the emitted beam through .

Next, FIG. 5B is a second embodiment of the scan beam splitter. The scan beam splitter 120-2 shown in FIG. 5B is implemented including a polarizing prism 121b of a Rochon prism structure, and includes a plurality of polarizing prisms 121b. It may further include an angle adjustment unit (R) using a mirror.

The polarizing prism 121b shown in FIG. 5B is implemented as a Rochon prism and is composed of a combination of two triangular prisms whose crystal axes are perpendicular to each other and made of different materials. Here, the polarizing prism 121b divides the scan beam incident through the first surface into an s-polarized beam that travels parallel to the scan beam (incident ray) at the boundary of the two triangular prisms, and the scan beam (incident ray) at a set angle. It is separated into a p-polarized beam that travels with and is emitted through the second side.

Here, the incident ray is an extra-ordinary ray that is emitted at an angle and an ordinary ray that is emitted parallel to the incident ray, depending on the wavelength of light and the refraction of the material at the boundary between the two triangular prism materials. is separated into

In the case of FIG. 5B, the s-polarized beam emitted parallel to the incident beam corresponds to normal ray, and the p-polarized beam traveling at an angle with the incident beam corresponds to abnormal ray.

Here, the polarizing prism 121b is installed (placed) rotated by a set angle (θ/2) based on the center of the boundary surface of the two triangular prisms. At this time, θ corresponds to the angle difference between the travel directions of the s-polarized beam and the p-polarized beam separately emitted from the center of the boundary surface, as shown in the upper figure.

That is, as shown in Figure 5b, the polarizing prism 121b is arranged in a state rotated by θ/2, which is half of the angle difference θ of the polarized beam.

In this second embodiment, the angle adjusting unit (R) includes first and second mirrors that are sequentially installed on the path of the p-polarized beam emitted through the second surface of the polarizing prism (121b) to change the beam path. (M1, M2) and third and second mirrors (M1, M2), which are sequentially installed on the path of the s-polarized beam emitted through the second surface to change the beam path and are installed symmetrically to the first and second mirrors (M1, M2). It includes a fourth mirror (M3, M4), and the angle of each mirror (M1~M4) can be adjusted.

By adjusting the angle of each mirror through this angle adjusting unit (R), the travel directions of the p-polarized beam that passed through the last second mirror (M2) and the s-polarized beam that passed through the fourth mirror (M4) are different from each other. Can be adjusted to different angles.

Next, FIG. 5C shows a third embodiment of the scan beam splitter. The scan beam splitter 120-3 shown in FIG. 5C includes a polarizing prism 121c of a Senarmont prism structure, and FIG. 5B As shown, it may include a position control unit (R) including M1 to M4.

The polarizing prism 121c shown in FIG. 5C is implemented as a Senarmont prism and is composed of a combination of two triangular prisms whose crystal axes are perpendicular to each other and made of different materials.

Here, the polarizing prism 121c is a p-polarized beam that travels parallel to the scan beam at the boundary of the two triangular prisms for the scan beam incident through the first surface, and an s-polarized beam that travels at a set angle with the scan beam. It is separated and emitted through the second side.

Here, the incident ray is divided into an ordinary ray, which is emitted at an angle depending on the wavelength of light and the refraction of the material at the boundary between the two triangular prism materials, and an extra-ordinary ray, which is emitted parallel to the incident ray. separated.

In FIG. 5C, the p-polarized beam that is emitted parallel to the incident beam corresponds to an abnormal ray, and the s-polarized beam that travels at an angle to the incident beam corresponds to a normal ray.

In the case of FIG. 5C, the basic structure and operating principle are the same as those of FIG. 5B except that it is implemented with a Senardmont prism, so repeated description thereof will be omitted.

Next, FIG. 5D shows a fourth embodiment of the scan beam splitter. The scan beam splitter 120-4 shown in FIG. 5D includes a polarizing prism 121d of a Wollaston prism structure, and in FIG. 5B It may include an angle adjustment unit (R) including M1 to M4 as shown.

The polarizing prism 121d is composed of a combination of two triangular prisms whose crystal axes are perpendicular to each other and made of different materials. The scan beam incident through the first surface is adjusted at a set angle with respect to the direction of the scan beam at the boundary surface of the two triangular prisms. It is separated into an s-polarized beam and a p-polarized beam, which proceed symmetrically to each other, and are emitted through the second surface.

In this Wollaston prism structure, if the crystal axis of the first triangular prism that meets the incident ray is perpendicular to the direction of travel of the incident ray, and the crystal axis of the second triangular prism is perpendicular to the first triangular prism, the incident ray is transmitted at the interface between the two materials. Depending on the wavelength and refractive index of the material, it is divided into normal rays and abnormal rays that emit at an angle.

The structure of Figure 5d has the advantage that, unlike Figures 5b or 5c, there is no need to separately rotate the polarizing prism. In addition, in this embodiment of FIG. 5D, the basic structure and operating principle of the angle adjusting unit R implemented including M1 to M4 and L are the same as those of FIG. 5B described above, and therefore detailed description will be omitted.

Figure 5e is a fifth embodiment of the scan beam splitter, and the scan beam splitter 120-5 shown in Figure 5e includes the first and second polarizing beam splitters (PBS1 and PBS2), and the first to sixth mirrors ( It is implemented including M1~M6).

The first polarizing beam splitter (PBS1) reflects the s-polarized beam component from the incident scan beam and transmits the p-polarized beam component. The first and second mirrors M1 and M2 are sequentially installed on the path of the s-polarized beam reflected from the first polarizing beam splitter PBS1 to change the beam path by 90 degrees.

The third to sixth mirrors (M3 to M6) are sequentially installed in a 'ㄷ' shape on the path of the p-polarized beam transmitted from the first polarizing beam splitter (PBS1) to change the beam path. Here, the third to fifth mirrors (M3 to M5) can change the path of the p-polarized beam transmitted from the first polarizing beam splitter (PBS1) by 90 degrees, and the sixth mirror (M6) can adjust the angle. And the angle of the p-polarized beam that has passed through the fifth mirror (M5) can be reflected at an angle greater than 90 degrees.

The second polarizing beam splitter (PBS2) uses the s-polarized beam reflected using the first mirror (M1) and the second mirror (M2) and the p-polarized beam reflected using the third to sixth mirrors (M3 to M6). Polarized beams are incident on each of the first and second sides and output at different angles through the third side.

The second polarizing beam splitter (PBS2) reflects the s-polarized beam incident on the first side and transmits the p-polarized beam incident on the second side, thereby dividing the reflected s-polarized beam and the transmitted p-polarized beam. Make sure to emit light through the third side. Of course, the s-polarized beam and the p-polarized beam emitted in this way proceed at different angles by the sixth mirror (M6) whose angle is adjustable.

Figure 5f is a sixth embodiment of the scan beam splitter, and the scan beam splitter 120-6 shown in Figure 5f includes the first and second polarizing beam splitters (PBS1 and PBS2), and the first to sixth mirrors ( M1~M6), and a wedge prism (W).

This FIG. 5f is a modified example of FIG. 5e, and instead of the angle adjustment of the sixth mirror (M6) being unnecessary, a wedge prism capable of changing the beam angle between the sixth mirror (M6) and the second polarizing beam splitter (PBS2) (W) is placed.

In Figure 5f, the third to sixth mirrors (M3 to M6) are sequentially installed in a 'ㄷ' shape on the path of the p-polarized beam transmitted from the first polarizing beam splitter (PBS1) to change the beam path by 90 degrees. You can. In addition, the wedge prism (W) can receive the beam reflected from the sixth mirror (M6) and output the beam by changing its propagation angle. This wedge prism (W) has a wedge shape and an inclined surface is formed, so that it can deflect the beam.

The second polarizing beam splitter (PBS2) ultimately receives the s-polarized beam that passed through the second mirror (M2) and the p-polarized beam that passed through the wedge prism (W) through the first and second sides, respectively, and receives the third polarized beam. The surface can be printed at different angles.

Figures 5g and 5h show the seventh and eighth embodiments of the scan beam splitter, respectively, and the basic principle is similar to Figures 5e and 5f. 5G and 5H have a structure that combines one beam splitter (BS) and one PBS (PBS) instead of two polarizing beam splitters (PBS1, PBS2).

First, Figure 5g shows the seventh embodiment of the scan beam splitter. The scan beam splitter 120-7 shown in Figure 5g includes a beam splitter (BS), first to sixth mirrors (M1 to M6), and polarization light. It is implemented including a beam splitter (PBS).

The beam splitter (BS) transmits part of the incident scan beam and reflects part. The first and second mirrors M1 and M2 are sequentially installed on the path of the beam reflected from the beam splitter and change the beam path by 90 degrees.

The third to fifth mirrors (M3 to M5) change the path of the p-polarized beam transmitted from the first polarizing beam splitter (PBS1) by 90 degrees. The sixth mirror (M6) has an adjustable angle and reflects the p-polarized beam that has passed through the fifth mirror (M5) at an angle greater than 90 degrees.

The polarizer (WP) is placed on either the path of the reflected beam or the transmitted beam of the beam splitter (BS) and passes only the polarization component of either s-polarization or p-polarization or linearly polarization at a specific angle. It can be made into a beam. For example, the polarizer (WP) may be installed between the beam splitter (BS) and the third mirror (M1) as shown in Figure 5g, or between the first mirror (M1) and the second mirror (M2) as indicated by the dotted line. can be installed in

The polarizing beam splitter (PBS) finally receives the beam that has passed through the second mirror (M2) and the beam that has passed through the sixth mirror (M6) through the first and second sides, respectively, and splits the beam through the third side. It emits light at different angles.

Figure 5h shows the eighth embodiment of the scan beam splitter. The scan beam splitter 120-7 shown in Figure 5h includes a beam splitter (BS), first to sixth mirrors (M1 to M6), and a polarizing beam splitter. (PBS), and a wedge prism (W).

This FIG. 5h is a modified example of FIG. 5g, and instead of requiring no angle adjustment of the sixth mirror (M6), a wedge prism (W) is arranged between the sixth mirror (M6) and the polarizing beam splitter (PBS). am. Since the specific principle is the same as in the case of FIG. 5f, redundant description is omitted.

Various structures of the scan beam splitter 120 (120-1, 120-2, 120-3, 120-4, 120-5, 120-6, 120-7, 120-8) shown in FIGS. 5A to 5H. is applicable to all of the first to fourth embodiments (FIGS. 1, 2, 3, and 4) of the present invention.

Referring again to FIG. 1, two polarized beams (s-polarized beam and p-polarized beam) emitted at different angles by the scan beam splitter 120 are transmitted to the scan unit 130.

The beam incident on the scan unit 130 passes through the horizontal scan mirror 131 (hereinafter referred to as x-scan mirror) and the vertical scan mirror 132 (hereinafter referred to as y-scan mirror) to a transmissive object, which is a transmissive object.

At this time, the penetrating body may correspond to various objects having permeability, such as cells, microorganisms, films, transparent objects, or sculptures.

Here, the scan unit 130 includes an x-scan mirror 131 and a y-scan mirror 132 to control the scanning position of the scan beam with respect to the transmitting object. The scan unit 130 uses the scan mirror to control the incident scan beam in the horizontal direction (x direction) and vertical direction (y direction) and transmits it to the transmitting body.

That is, the scan unit 130 receives a scan beam consisting of two polarized beams emitted at different angles from the scan beam splitter 120 and projects it onto the transmitting object, and the scanning position of the scan beam with respect to the transmitting object is horizontal and It controls the vertical direction and serves to transmit it to the transmitting body.

In the first embodiment of FIG. 1, the scanning unit 130 uses a mirror scanner. The mirror scanner has an x-scan mirror 131 that scans the object (transmissive body) in the -consists of an x-y scanner with a scanning mirror (132). Of course, in the case of the present invention, the scanning unit is not limited to a mirror scanner, and similar means or other known scanning means may be used. For example, instead of an x-scan mirror and a y-scan mirror, an x-space modulation scanner and a y-space modulation scanner can be replaced.

The scan unit 130 may be operated by receiving a scanning control signal from a scan control unit (not shown) within the signal processing unit 150. The scan control unit (not shown) may generate a scanning control signal to control the scanning position of the scan unit 130. Here, the scanning control signal may include a horizontal scan signal and a vertical scan signal for controlling the x-scan mirror and the y-scan mirror in the horizontal and vertical directions, respectively.

At this time, the horizontal scan signal is a signal for sequentially moving the scan position in the horizontal direction (x-axis direction) by preset distance units, and has a period T for scan movement in arbitrary distance units. The vertical scan signal is a control signal that enables a horizontal scan operation for the next y position when the horizontal scan operation in the x-axis direction for an arbitrary y position is completed, and its period is larger than the horizontal scan signal.

In response to this control signal, the optical axes of the first and second curved beams are rotated as the scan mirror rotates, and the scan beam pattern with the rotated optical axes is projected onto the object (transmitting body). In this way, the scan unit 130 can project an interference beam (scan beam by the scan unit) between the first and second curvature beams onto an object using a scan mirror. Here, of course, the s-wave component and the p-wave component for each curvature beam have a structure in which they are separated vertically by the previous scan beam splitter 120, and the interference beam may also have a structure in which the two polarized waves are separated vertically.

Of course, the scan unit 130 has a structure using a horizontal scan mirror 131 and a vertical scan mirror 132 as shown in FIG. 1, as well as a horizontal scan mirror 331 and a translation stage 332 as shown in FIG. 3, which will be described later. It is also possible to change the scan unit structure using . In addition, in the structure of FIG. 3, when replacing the horizontal scan mirror 331 with a spatial modulation scanner, the scan unit structure can also be changed using a spatial modulation scanner and a translation stage 332. do. Additionally, in the structure of FIG. 1, the horizontal scan mirror 131 and the vertical scan mirror 132 can be replaced with a horizontal spatial modulation scanner and a vertical spatial modulation scanner, respectively.

In this way, the scan unit 130 can be implemented by a combination of a horizontal scan mirror and a vertical scan mirror, a combination of a horizontal scan mirror and a translation stage, and a combination of a spatial light modulator and a translation stage. Other embodiments of the scan unit will be described in detail later with reference to FIG. 3. Here, the table portion on which the object of the translation stage is placed may be made of a transparent material that allows the wavelength of the laser light source to pass through, or may be made of empty space.

Here, the scan beam irradiated by the scan unit 130 may be transmitted to the object through the scan beam transmitter 135.

The scan beam transmitter 135 includes at least one lens and is disposed between the scan unit 130 and the object, so that the scan beam consisting of two polarized beams traveling at different angles is stably transmitted to the object without distortion. It plays a role in conveying.

The scan beam transmitting unit 135 may be composed of at least one lens, and a scan lens may be added for the purpose of compensating for distortion of the scanner.

This scan beam transmitting unit 135 may include an objective lens, and may be comprised of a combination of a scan lens, a tube lens, and an objective lens, as shown in FIG. 9, which will be described later. .

Figure 9 is a diagram illustrating the configuration of a scan beam transmission unit according to an embodiment of the present invention. Figure 9(a) illustrates that the scan beam transmitting unit 135 is composed of a combination of a scan lens, a tube lens, and an objective lens. Of course, depending on the configuration of the light detection unit 140, a beam splitter may be added to the scan beam transmitting unit as shown in (b) of FIG. 9.

This scan beam transmitting unit 135 provides three effects. First, the scan beam transmitter 135 can compensate for optical distortion caused by the two-axis scanner between the scan unit 130 and the object.

Additionally, the scan beam transmitter 135 allows scanning an area optimized according to the size of the scan object. In a situation where the scan beam transmitter 135 is absent, if the size of the object is smaller than the scan area by the scan beam, a problem occurs where the efficiency is very low due to power loss of the beam, and the scan area by the scan beam is very low. If the size of the object is larger, there is a problem that the entire area of the object cannot be scanned. However, in the embodiment of the present invention, the scan beam transmitter 135 implemented including at least one lens is used to transmit the scan beam to the object. By transmitting it to , you can scan an area optimized for the size of the object (sample).

In addition, the scan beam transmitter 135 can efficiently transmit the beam to a desired distance with minimal power loss. When scanning an object located at a long distance, if there is no scanning beam transmitter, the efficiency may be very low due to beam power loss.

In an embodiment of the present invention, the scan beam irradiated by the scan unit 130 passes through the scan beam transmitter 135, a transmitting body, and enters the light detection unit 140. As described above, the scan beam consists of two polarized beams (s-polarized beam and p-polarized beam) split by the scan beam splitter 120.

The light detection unit 140 separates and detects the s-polarized beam and the p-polarized beam from the beam that is projected by the scan unit 130 and then passes through the transmitting body.

Then, the light detection unit 140 transmits the separately detected s-polarized beam and the p-polarized beam to the signal processing unit 150.

Here, as shown in FIG. 1, the light detection unit 140 includes a first concentrator 141a, a first polarizer 142a, a first photodetector 143a, a second concentrator 141b, a second polarizer 142b, and a first concentrator 141b. Includes 2 photodetectors 143b.

The first concentrator 141a is disposed in a direction offset from the optical axis of the beam projected to the transmitting material, and condenses the beam that has transmitted through the transmitting material. This first concentrator 141a may be implemented as a condenser lens.

The first polarizer 142a passes only the s-polarized beam component in the spatially integrated beam through the first concentrator 141a. That is, the first polarizer 142a is disposed behind the first concentrator 141a and transmits only the s-polarized beam component of the beam collected by the first concentrator 141a.

The first photodetector 143a detects the s-polarized beam that has passed through the first polarizer 142a and transmits it to the first signal processing unit 151.

The second concentrator 141b is disposed in a direction that is offset from the optical axis of the beam projected to the transmitting body, but is disposed in a different position from the first concentrator 141a, and condenses the beam that has transmitted through the transmitting body. This second concentrator 141b may be implemented as a condenser lens.

Here, the second concentrator 141b may be arranged symmetrically or asymmetrically with the first concentrator 141a.

The second polarizer 142b passes only the p-polarized beam component in the spatially integrated beam through the second concentrator 141b. That is, the second polarizer 142b is disposed at the rear of the second concentrator 141b and transmits only the p-polarized beam component of the beam collected by the second concentrator 141b.

The second photodetector 143b detects the p-polarized beam that has passed through the second polarizer 142b and transmits it to the second signal processing unit 152.

Of course, the structure of the light detection unit 140 in the present invention is not necessarily limited to FIG. 1, and can also be changed to the structure of FIG. 2, which will be described later. This will be explained in detail later.

The signal processing unit 150 processes signals of the s-polarized beam and the p-polarized beam separately detected by the light detection unit 150 to generate a hologram for the transmitting object.

In the case of an embodiment of the present invention, the scan beam generated by the scan beam generator 110 is split into two polarized beams according to polarization, and then the divided two polarized beams are used as scan beams to scan the object, so the scan beam Compared to the case of scanning the object as is without dividing it, twice the sampling is possible compared to the same time, and a hologram of the object can be created at twice the speed.

Figure 6 is a diagram explaining the operation of a signal processing unit according to an embodiment of the present invention.

Referring to FIGS. 1 and 6 , the signal processing unit 151 includes a first signal processing unit 151, a second signal processing unit 152, and a cross-array signal processing unit 153. The structure and operating principle of the signal processing unit 150 can be equally applied to the systems (FIGS. 2, 3, and 4) according to the second to fourth embodiments of the present invention.

The first signal processor 151 processes the signal of the s-polarized beam detected by the first photodetector 143a and sends it to the cross-array processor 153, and the second signal processor 142 processes the signal of the s-polarized beam detected by the first photodetector 143a. ) The signal of the p-polarized beam detected is processed and sent to the cross-array processing unit 153. These operations may occur simultaneously.

Then, as shown in FIG. 6, the cross-array signal processing unit 150 synthesizes the hologram signal processed in the first signal processing unit 151 and the hologram signal processed in the second signal processing unit 152 by alternating them line by line. Creates a hologram for a transparent object.

According to this, the scan beam generated by the scan beam generator 110 is divided into two beams (s-polarized beam, p-polarized beam) according to polarization, and the two divided polarized beams are simultaneously transmitted to the object (transmitter). By projecting, two lines of signals can be sampled (scanned) at once (unit time), so the number of samples in the y direction is doubled compared to the case of scanning without splitting the scan beam, and the hologram of the object can be produced at twice the speed. Can be produced at high speed.

The operation of the signal processing unit 150 will be described in more detail as follows.

In Figure 1, the first photodetector 143a generates a current signal proportional to the intensity of the concentrated light and transmits it to a two-channel lock-in amplifier, and the two-channel lock-in amplifier demodulates the current signal. In-phase and quadrature-phase hologram information of an object (transparent body) is extracted as an electrical signal. Of course, a two-channel lock-in amplifier can be implemented by converting it into a digital signal through an analog to digital converter (ADC) and processing it on a computer.

Then, the extracted electrical signal is converted into a digital signal and transmitted to a digital computer. In the digital computer, the digital signals of the real and imaginary parts are synthesized using complex number synthesis and stored according to each scanning position, thereby transmitting the object (transmission). complex holographic information of the body) is recorded. At this time, the recorded hologram is called the first hologram.

In Figure 1, the second photodetector 143b generates a current signal proportional to the intensity of the focused light and transmits it to a two-channel lock-in amplifier, and the two-channel lock-in amplifier demodulates the current signal. In-phase and quadrature-phase hologram information of an object (transmitting body) is extracted as an electrical signal. Of course, a two-channel lock-in amplifier can be implemented by converting it into a digital signal through an analog to digital converter (ADC) and processing it on a computer.

Then, the extracted electrical signal is converted into a digital signal and transmitted to a digital computer. In the digital computer, the digital signals of the real and imaginary parts are synthesized using complex number synthesis and stored according to each scanning position, thereby transmitting the object (transmission). complex holographic information of the body) is recorded. At this time, the recorded hologram is called the second hologram.

The signal processing unit 150 can synthesize the first hologram and the second hologram by alternating them to implement a scan that is twice as long as the scan by the horizontal scan mirror.

Next, a polarization-splitting double scanning holography system for a transmissive material according to a second embodiment of the present invention will be described with reference to FIG. 2A.

As shown in FIG. 2A, the polarization splitting double scanning holography system 200 for a transmitting body according to the second embodiment of the present invention largely includes a scan beam generator 110, a scan beam splitter 120, and a scan beam transmitter ( 135), a scanning unit 130, a light detection unit 240, and a signal processing unit 150. Redundant descriptions of components having the same symbols as those in FIG. 1 will be omitted.

In the case of the second embodiment, the basic structure of the device is the same as that of the first embodiment, but the configuration of the light detection unit 240 is different, and the operating principle is as follows.

In the second embodiment, the light detection unit 240 includes a first light splitter 241, a second light splitter 242, a first concentrator 243a, a second concentrator 243b, a first light detector 244a, and a second light detector 243b. Includes 2 photodetectors 244b.

The first light splitter 241 is disposed on the optical axis of the light projected to the transmitting material and receives the beam that has passed through the transmitting material and reflects it to the outside. This first light splitter 241 can reflect a part of the beam that has passed through the transmitting material and transmit it to the second light splitter 242. The first optical splitter 241 can be implemented as a general beam splitter.

The second light splitter 242 receives the light reflected from the first light splitter 241, transmits the p-polarized beam component of the incident beam, and reflects the s-polarized beam component.

This second light splitter 242 may be implemented as a polarization beam splitter (PBS). In this case, the s-polarized beam is reflected from the second light splitter 242 and transmitted to the first concentrator 243a, and p- The polarized beam passes through and is delivered to the second concentrator 243b.

The first concentrator 243a condenses the s-polarized beam component reflected by the second light splitter 242, and the second concentrator 243b condenses the p-polarized beam component transmitted by the second light splitter 242. do. These first and second concentrators 243a and 243b may be implemented as condensing lenses.

The first photodetector 244a detects a spatially integrated beam (s-polarized beam) through the first concentrator 243a and transmits it to the first signal processor 151 in the signal processor 150. Additionally, the second photodetector 244b detects a spatially integrated beam (p-polarized beam) through the second concentrator 243b and transmits it to the second signal processor 152 in the signal processor 150.

These first and second photodetectors 244a and 244b respectively generate first and second electrical signals in proportion to the intensity of transmitted light. The first photodetector 244a transmits the first electrical signal to the first signal processor 151, and the second photodetector 244b transmits the second electrical signal to the second signal processor 152.

Here, of course, the second beam splitter 242 can be replaced with a beam splitter (BS) instead of the polarization beam splitter (PBS), and in this case, the role of the polarization beam splitter (PBS) is through the combination of the beam splitter (BS) and the two polarizers. can be performed. This is explained through Figure 2b.

In Figure 2b, the light detection unit 240 includes a first light splitter 241, a second light splitter 242, a first polarizer 245a, a second polarizer 245b, a first concentrator 243a, and a second concentrator ( 243b), a first photodetector 244a, and a second photodetector 244b.

In FIG. 2B, reference numerals 241, 244a, and 244b perform the same functions as those in FIG. 2A, so duplicate description thereof will be omitted.

In Figure 2b, the second light splitter 242 is a BS (Beam Splitter), which receives the light reflected from the first light splitter 241 and splits it by transmitting part of the incident beam and reflecting part of it.

The first polarizer 245a receives the beam reflected from the second light splitter 242 and passes only the s-polarized beam component, and the second polarizer 245b receives the beam transmitted from the second light splitter 242 and passes only the s-polarized beam component. Only the polarized beam component passes through.

The first concentrator 243a condenses the s-polarized beam component that has passed through the first polarizer 245a, and the second concentrator 243b condenses the p-polarized beam component that has passed through the second polarizer 245b. The subsequent operations of the first and second photo detectors 244a and 244b are the same as those described above.

Next, a polarization-splitting double scanning holography system for a transmissive material according to a third embodiment of the present invention will be described with reference to FIG. 3.

As shown in FIG. 3, the polarization splitting double scanning holography system 300 for a transmitting body according to the third embodiment of the present invention largely includes a scan beam generator 110, a scan beam splitter 120, and a scan unit 330. , includes a scan beam transmission unit 335, a light detection unit 140, and a signal processing unit 150. Redundant descriptions of components having the same symbols as those in FIG. 1 will be omitted.

In this third embodiment, the basic structure of the device is the same as the first embodiment, but the configuration of the scan unit 330 is different, and the operating principle is as follows.

In FIG. 3, the scan unit 330 is installed at the rear end of the scan beam splitter 120 to control the scanning position of the scan beam with respect to the transmitting object in the horizontal and vertical directions and detects the scan incident from the scan beam splitter 120. A scanning mirror 331 that controls the beam in the horizontal direction (x direction) and transmits it to the transmitting body, and a translation stage 332 that moves the transmitting body in the vertical direction (y direction) at the rear end of the transmitting body. Includes.

That is, in the case of FIG. 3, a scan beam including two polarized beams emitted from the scan beam splitter 330 is incident on the scan unit 330. The beam incident on the scanning unit 330 is transmitted to the transmitting body through the scanning mirror 331 and the scanning beam transmitting unit 335. Here, the scan mirror 331 scans the transparent body in the x-direction, and the translation stage 332 located at the rear of the transparent body scans the transparent body in the y-direction.

The scan mirror 331 controls the scan beam incident from the scan beam splitter 120 in the horizontal direction and transmits it to the transmitting body. The translation stage 332 is installed at the rear of the transmissive body and moves the transmissive body receiving the scan beam directly in the vertical direction, enabling y-direction scanning of the transmissive body through the scan beam.

This translation stage 332 corresponds to a moving objective plate in which the objective plate on which the transmitting material is placed is movable in the y-axis direction. Although this translation stage 332 is physically separated from the scan mirror 331, it is a means of controlling the scanning position of the beam with respect to the transmitting object, so it is a component of the scan unit 330 together with the scan mirror 331. It is included as

In this way, the scan unit 330 uses the scan mirror 331 and the translation stage 332 to control the scan beam in the horizontal direction (x direction) and the vertical direction (y direction) based on the transmitting object.

In this third embodiment, the scanning unit 330 uses a mirror scanner. The mirror scanner has an x-scan mirror 321 that scans the transmitting object in the x direction (left and right directions) around the y axis. In the case of the present invention, the scanning unit is not limited to a mirror scanner, and similar means or other known scanning means may be used.

Like the first embodiment, the scan unit 330 may be operated by receiving a scanning control signal from a scan control unit (not shown) within the signal processing unit 150. The scan control unit (not shown) generates a scanning control signal to control the scanning position of the scan unit 330. Here, the scanning control signal may include a horizontal scan signal and a vertical scan signal for controlling the scan mirror 331 and the translation stage 332 in the horizontal and vertical directions, respectively.

At this time, the horizontal scan signal is a signal for sequentially moving the scan position in the horizontal direction (x-axis direction) by preset distance units, and has a period T for scan movement in arbitrary distance units. The vertical scan signal, which is a signal that moves the translation stage 332 in the vertical direction, is a translation that enables a horizontal scan operation for the next y position when the horizontal scan operation in the x-axis direction for an arbitrary y position is completed. As a stage control signal, its period is larger than that of the horizontal scan signal.

Of course, in this structure of FIG. 3, the scan mirror 331 can be replaced with a spatial modulation scanner. In this case, the scanning unit 330 may be implemented including a spatial modulation scanner 331 and a translation stage 332. Hereinafter, for convenience of explanation, the spatial modulation scanner will be described by assigning code 331.

In this case, the beam incident on the scan unit 330 is transmitted to the transmitting body through the spatial modulation scanner 331 and the scan beam transfer unit 335. Here, the spatial modulation scanner 331 scans the transparent body in the x-direction, and the translation stage 332 located at the rear of the transparent body scans the transparent body in the y-direction.

That is, the spatial modulation scanner 331 controls the scan beam incident from the scan beam splitter 120 in the horizontal direction and transmits it to the transmitting body, and the translation stage 132 receives the scan beam incident at the rear end of the transmitting body. By directly moving the transmitting object in the vertical direction, y-direction scanning of the transmitting object through a scan beam is also possible.

In this way, the scan unit 330 uses the spatial modulation scanner 331 and the translation stage 332 to control the scan beam in the horizontal direction (x direction) and vertical direction (y direction) based on the transmitting object. It may be possible.

At this time, the spatial modulation scanner modulates the spatial distribution of the incident beam and operates to scan the beam in a specific direction.

A spatial modulation scanner can be implemented with a spatial light modulator (SLM), a digital micromirror device (DMD), an acoustic-optic deflector, etc. Accordingly, the spatial modulation scanner is configured to include one type of spatial modulation scanner selected from SLM, DMD, and acoustic-optical deflector.

Figure 7 is a diagram explaining the operating principle of a spatial modulation scanner. The spatial modulation scanner is an element that can replace the scan mirror 131 in the scan unit 330 of FIG. 3 and corresponds to a horizontal spatial modulation scanner that scans an object in the x direction. Figure 7 explains the principle of this horizontal spatial modulation scanner.

As shown in FIG. 7, in a spatial modulation scanner, the spacing of the grating pattern (P) changes sequentially over time according to the input of a scanning control signal by a scan control unit (not shown), thereby controlling the scan beam in the horizontal direction. can do.

In other words, the spacing of the grating pattern formed in the horizontal spatial modulation scanner by the electrical signal is adjusted over time, allowing the incident beam to move in the x-direction. In general, as the spacing between patterns becomes narrower, the light is bent at a greater angle.

Therefore, in the case of a horizontal spatial modulation scanner, the scan beam can move in the horizontal direction by adjusting the size of the gap between the grating patterns (P) formed along the horizontal direction according to the scanning control signal. In this way, in the case of a spatial modulation scanner, the direction of the incident beam is electrically controlled.

In this case as well, the scan unit 330 operates by receiving a scanning control signal from the scan control unit (not shown) in the signal processing unit 150. Here, the scanning control signal for the spatial modulation scanner 331 may include a signal that sequentially changes the spacing size of the grating pattern over time. Additionally, the scanning control signal for the translation stage 332 may include a signal that moves the translation stage 332 in the vertical direction over time.

Additionally, the scanning control signal may include a horizontal scan signal and a vertical scan signal for controlling the scan beam in the horizontal and vertical directions, respectively.

The horizontal scan signal for controlling the scan beam incident on the spatial modulation scanner 331 in the horizontal direction is a signal for sequentially moving the scan position in the horizontal direction (x-axis direction) by preset distance units, and is a random distance unit. It has a period T for scan movement. The vertical scan signal, which is a signal that moves the translation stage 332 in the vertical direction, is a translation that enables a horizontal scan operation for the next y position when the horizontal scan operation in the x-axis direction for an arbitrary y position is completed. As a stage control signal, its period is larger than that of the horizontal scan signal.

Here, both the horizontal scan mirror 131 and the vertical scan mirror 132 of FIG. 1 can be replaced with a spatial modulation scanner. In this case, the scanning unit 120 is a horizontal spatial modulation scanner (x-space) that scans the object in the x direction. It can be implemented as an x-y scanner with a modulation scanner) and a vertical spatial modulation scanner (y-space modulation scanner) scanning in the y direction.

Figure 8 is a diagram explaining the operating principle of the horizontal and vertical spatial modulation scanner. As shown in FIG. 8, in a vertical or horizontal spatial modulation scanner, the spacing of the grating pattern (P) changes sequentially over time according to the input of a scanning control signal by a scan control unit (not shown), thereby directing the scan beam vertically. Or control in the horizontal direction.

In other words, the spacing of the grating pattern formed in the spatial modulation scanner by the electrical signal is adjusted over time, allowing the incident beam to move in the x-direction. In general, as the spacing between patterns becomes narrower, the light is bent at a greater angle.

For example, in the case of a horizontal spatial modulation scanner, the scan beam can move in the horizontal direction by adjusting the size of the gap between the grating patterns (P) formed along the horizontal direction according to the scanning control signal. In the case of a vertical spatial modulation scanner, the scan beam can move in the vertical direction by adjusting the size of the gap between the grating patterns (P) formed along the vertical direction according to the scanning control signal.

In this way, in the case of a spatial modulation scanner, the direction of the incident beam is electrically controlled.

Next, a polarization-splitting double scanning holography system for a transmissive material according to a fourth embodiment of the present invention will be described with reference to FIG. 4A.

As shown in FIG. 4A, the polarization splitting double scanning holography system 400 for a transmitting body according to the fourth embodiment of the present invention largely includes a scan beam generator 110, a scan beam splitter 120, and a scan unit 330. , includes a light detection unit 240 and a signal processing unit 150. Redundant descriptions of components having the same symbols as those in FIG. 1 will be omitted.

In the case of the fourth embodiment, the basic structure of the device is the same as that of the first embodiment, but the configurations of the scanning unit 330 and the light detection unit 240 are different. Here, the operation of the scanning unit 330 has been described in detail with reference to FIG. 3, and the operation of the light detection unit 240 has been described in detail with reference to FIG. 2A, so duplicate descriptions will be omitted.

Meanwhile, the first to fourth embodiments of the present invention may additionally include a circular polarization conversion unit. The role of this circular polarization converter can be implemented through the configuration of λ/4 wave plates (WP; WP1, WP2) inserted with dotted lines in FIGS. 1 and 2A, respectively. In the case of FIGS. 3 and 4A, a circular polarization conversion unit like that of FIGS. 1 and 2A may also be applied.

1 as a representative example, the case of FIG. 1 includes a first λ/4 wave plate (WP1) and a second λ/4 wave plate (WP2).

At this time, the first λ/4 wave plate WP1 is installed between the scan unit 130 and the transmitting material to convert the scan beam into circularly polarized light and project it to the transmitting material. The second λ/4 wave plate WP2 is installed between the transmitter and the light detection unit 140 to convert the circularly polarized beam back into linearly polarized light and provide it to the light detection unit 140. Here, specifically, the second λ/4 wave plate WP2 is separately installed between the transmitting body and the first light collecting part 141a, and between the transmitting body and the second light collecting part 141b.

As in the embodiment of the present invention, a method of splitting a scan beam into two according to polarization and individually detecting beams corresponding to the polarization is to separate a first hologram and a second hologram in the case of an object whose reflection or transmittance depends on polarization. There may be differences depending on polarization. In order to eliminate this polarization difference, a wave plate is placed between the scan unit 130 and the object (transmitter) to convert the polarization of the scan beam into circular polarization and project it onto the object, and the object (transmitter) and the concentrator 141 By using a method of converting back to linearly polarized light by placing a wave plate between them, the first and second holograms can be recorded regardless of the polarization dependence of the object.

In addition, in the case of FIG. 2A, the first λ/4 wave plate WP1 is installed in the path between the scan unit 130 and the transmitting body, more specifically, between the scan unit 130 and the first optical splitter 241. In addition, the second λ/4 wave plate WP2 can be installed between the transmitter and the light detection unit 240, and more specifically, between the first and second light splitters 241 and 242 on the corresponding path. there is. Of course, various modifications may exist in the installation location of the wave plate.

According to the present invention, it is possible to obtain a hologram for a transparent object at ultra-high speed, faster than the scanning speed of a scan mirror.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached patent claims.

100,200,300,400: Polarization splitting double scanning holography system
110: scan beam generator 111: first optical splitter
112: phase modulation means 113: first lens
114: third lens 115: second lens
116: fourth lens 117: interference means
120: scan beam splitter 130: scan unit
131: x-scan mirror 132: y-scan mirror
140: light detection unit 141a: first concentrator
141b: second concentrator 142a: first polarizer
142b: second polarizer 143a: first photodetector
143b: second photodetector 150: signal processing unit
151: first signal processing unit 152: second signal processing unit
153: cross-array synthesis unit 240: light detection unit
241: first optical splitter 242: second optical splitter
243a: first concentrator 243b: second concentrator
244a: first photodetector 244b: second photodetector
330: scanning unit 331: scanning mirror
332: Translation stage 135,335: Scan beam transmission unit

Claims (21)

After modulating the phase of the first beam divided from the light source and converting it into a first curvature beam through the first beam curvature generator and converting the second beam into a second curvature beam through the second beam curvature generator, the first and a scan beam generator that forms a scan beam by interfering with the second curvature beam;
a scan beam splitter that splits the scan beam into an s-polarized beam and a p-polarized beam and emits the two split polarized beams at different angles;
A scan beam consisting of two polarized beams emitted at different angles is received from the scan beam splitter and projected onto a transmitting body, and the scanning position of the scan beam with respect to the transmitting body is controlled in the horizontal and vertical directions and transmitted to the transmitting body. a scanning unit for
a scan beam transmission unit made of at least one lens, disposed between the scan unit and the transmitting body, and transmitting a scan beam consisting of two polarized beams traveling at different angles to the transmitting body;
a light detector including a first photodetector for separating and detecting the s-polarized beam from the beam passing through the transmitting body and a second photodetector for separating and detecting the p-polarized beam; and
A signal processing unit that processes signals of the separately detected s-polarized beam and p-polarized beam to generate a hologram for the transmitting body,
The signal processing unit,
a first signal processor that processes the signal of the s-polarized beam detected by the first photodetector;
a second signal processor that processes the signal of the p-polarized beam detected by the second photodetector; and
A polarization splitting double signal processor comprising a cross-array signal processor that generates a hologram for the transmitting object by synthesizing the hologram signal processed in the first signal processor and the hologram signal processed in the second signal processor by alternating the lines one by one. Scanning holography system. In claim 1,
The light detection unit,
a first concentrator disposed in a direction biased to the optical axis of the beam projected to the transmitting body and concentrating the beam that has passed through the transmitting body;
a first polarizer that passes only the s-polarized beam component in the spatially integrated beam through the first concentrator;
The first photodetector detects the s-polarized beam that has passed through the first polarizer;
a second concentrator disposed in a direction biased to the optical axis of the beam projected to the transmitting body and at a different position from the first concentrator, and concentrating the beam that has transmitted through the transmitting body;
a second polarizer that passes only the p-polarized beam component of the spatially integrated beam through the second concentrator; and
A polarization-splitting double scanning holography system comprising the second photodetector for detecting a p-polarized beam that has passed through the second polarizer. In claim 1,
The light detection unit,
a first light splitter disposed on the optical axis of the light projected to the transmitting body and receiving the beam passing through the transmitting body and reflecting it to the outside;
a second light splitter that receives the light reflected from the first light splitter and transmits the p-polarized beam component and reflects the s-polarized beam component of the incident beam;
a first concentrator that focuses the s-polarized beam component reflected by the second light splitter;
a second concentrator for concentrating the p-polarized beam component transmitted from the second light splitter;
The first photodetector detects a spatially integrated beam through the first concentrator; and
A polarization-splitting double scanning holography system including the second photodetector that detects a spatially integrated beam through the second concentrator. In claim 1,
The light detection unit,
a first light splitter disposed on the optical axis of the light projected to the transmitting body and receiving the beam passing through the transmitting body and reflecting it to the outside;
a second light splitter that receives the light reflected from the first light splitter, transmits part of the incident beam, and reflects part of the incident beam;
a first polarizer that receives the beam reflected from the second light splitter and passes only the s-polarized beam component;
a second polarizer that receives the beam transmitted from the second light splitter and passes only the p-polarized beam component;
a first concentrator that focuses the s-polarized beam component that has passed through the first polarizer;
a second concentrator that focuses the p-polarized beam component that has passed through the second polarizer;
The first photodetector detects a spatially integrated beam through the first concentrator; and
A polarization-splitting double scanning holography system including the second photodetector that detects a spatially integrated beam through the second concentrator. delete In claim 1,
The scan beam splitter,
A beam displacer is made of an anisotropic optical material and separates the scan beam incident through the first side into an s-polarized beam and a p-polarized beam with polarizations orthogonal to each other and emits them in parallel through the second side. ; and
Includes a wedge prism installed on the beam path of one of the s-polarized beam and the p-polarized beam emitted through the second surface to change the traveling angle of the beam so that the two beams are emitted at different angles. Polarization splitting double scanning holography system. In claim 6,
The scan beam splitter,
It is installed on the path of the shorter p-polarized beam among the paths of the s-polarized beam and the p-polarized beam emitted through the second surface, and is implemented with the same material as the beam displacer, so that the emitted s-polarized beam A polarization-splitting double scanning holography system further comprising an optical path difference correction unit that compensates for the difference in optical path length between the and p-polarized beams. In claim 1,
The scan beam splitter,
It consists of a combination of two triangular prisms whose crystal axes are perpendicular to each other and are made of different materials, and a first polarized beam that transmits a scan beam incident through the first surface parallel to the scan beam at the boundary surface of the two triangular prisms It includes a polarizing prism of a Rochon prism or Senarmont prism structure that separates a polarized beam and a second polarized beam traveling at a set angle and emits them through a second surface,
If the first polarized beam is an s-polarized beam, the second polarized beam is a p-polarized beam, and if the first polarized beam is a p-polarized beam, the second polarized beam is an s-polarized beam. Polarization splitting double scanning holography system . In claim 8,
The polarizing prism is installed rotated by a set angle based on the center of the boundary surface,
The setting angle is,
A polarization-splitting double scanning holography system with θ/2 corresponding to half of the angular difference (θ) between the travel directions of the first and second polarized beams separately emitted from the center of the boundary surface. In claim 9,
The scan beam splitter,
First and second mirrors are sequentially installed on the path of the second polarized beam emitted through the second surface to change the beam path, and sequentially installed on the path of the first polarized beam emitted through the second surface. It is installed to change the beam path and further includes an angle adjustment unit including third and fourth mirrors installed symmetrically with the first and second mirrors,
A polarization split double scanning holography system in which the travel directions of the second polarized beam passing through the second mirror and the first polarized beam passing through the fourth mirror are adjusted to different angles by adjusting the angle of each mirror by the angle adjusting unit. . In claim 1,
The scan beam splitter,
It is composed of a combination of two triangular prisms whose crystal axes are perpendicular to each other and made of different materials, and the scan beam incident through the first surface is symmetrically directed at the boundary surface of the two triangular prisms at a set angle with respect to the direction of the scan beam. A polarization splitting double scanning holography system comprising a polarizing prism of a Wollaston prism structure that separates the s-polarized beam and the p-polarized beam and emits them through a second surface. In claim 11,
The scan beam splitter,
First and second mirrors sequentially installed on the path of the p-polarized beam emitted through the second surface to change the beam path, and sequentially installed on the path of the s-polarized beam emitted through the second surface. It is installed to change the beam path and further includes an angle adjustment unit including third and fourth mirrors installed symmetrically with the first and second mirrors,
A polarization splitting double scanning holography system in which the travel directions of the p-polarized beam passing through the second mirror and the s-polarized beam passing through the fourth mirror are adjusted to different angles by adjusting the angle of each mirror by the angle adjusting unit. . In claim 1,
The scan beam splitter,
a first polarizing beam splitter that reflects the s-polarized beam component from the incident scan beam and transmits the p-polarized beam component;
first and second mirrors sequentially installed on the path of the s-polarized beam reflected from the first polarizing beam splitter to change the beam path by 90 degrees;
third to fifth mirrors sequentially installed on the path of the p-polarized beam transmitted from the first polarizing beam splitter to change the beam path by 90 degrees; and
a sixth mirror whose angle is adjustable and which reflects the angle of the p-polarized beam that has passed through the fifth mirror at an angle greater than 90 degrees; and
A second polarizing beam splitter that receives the s-polarized beam that has passed through the second mirror and the p-polarized beam that has passed through the sixth mirror through the first and second sides, respectively, and outputs them at different angles through the third side. Polarization-splitting double scanning holography system including. In claim 1,
The scan beam splitter,
a first polarizing beam splitter that reflects the s-polarized beam component from the incident scan beam and transmits the p-polarized beam component;
first and second mirrors sequentially installed on the path of the s-polarized beam reflected from the first polarizing beam splitter to change the beam path by 90 degrees;
third to sixth mirrors sequentially installed on the path of the p-polarized beam transmitted from the first polarizing beam splitter to change the beam path by 90 degrees;
a wedge prism that receives the beam reflected from the sixth mirror and outputs the beam by changing its propagation angle; and
A second polarizing beam splitter that receives the s-polarized beam that has passed through the second mirror and the p-polarized beam that has passed through the wedge prism through the first and second sides, respectively, and outputs them at different angles through the third side. A polarization splitting double scanning holography system. In claim 1,
The scan beam splitter,
A beam splitter that transmits part of the incident scan beam and reflects part of it;
first and second mirrors sequentially installed on the path of the beam reflected from the beam splitter to change the beam path by 90 degrees;
third to fifth mirrors sequentially installed on the path of the beam transmitted from the beam splitter to change the beam path by 90 degrees;
A polarizer disposed on one of the paths of the reflected beam or the transmitted beam of the beam splitter to allow only one polarization component of s-polarization and p-polarization to pass or to create a linearly polarized beam at a specific angle;
a sixth mirror whose angle is adjustable and which reflects the angle of the beam passing through the fifth mirror at an angle greater than 90 degrees; and
The beam that has passed through the second mirror and the beam that has passed through the sixth mirror are incident through the first and second sides, respectively, and are transmitted to the third side. A polarization splitting double scanning holography system that includes a polarizing beam splitter that outputs output at different angles. In claim 1,
The scan beam splitter,
A beam splitter that transmits part of the incident scan beam and reflects part of it;
first and second mirrors sequentially installed on the path of the beam reflected from the beam splitter to change the beam path by 90 degrees;
third to sixth mirrors sequentially installed on the path of the beam transmitted from the beam splitter to change the beam path by 90 degrees;
A polarizer disposed on one of the paths of the reflected beam or the transmitted beam of the beam splitter to allow only one polarization component of s-polarization and p-polarization to pass or to create a linearly polarized beam at a specific angle;
a wedge prism that receives the beam reflected from the sixth mirror and outputs the beam by changing its propagation angle; and
A polarization splitting double scanning holography system including a polarizing beam splitter that receives the beam that has passed through the second mirror and the beam that has passed through the wedge prism through the first and second sides, respectively, and outputs them at different angles through the third side. . In claim 1,
a first λ/4 wave plate installed between the scan unit and the transmitting body to convert the scan beam into circularly polarized light and project it to the transmitting body; and
A polarization-splitting double scanning holography system further comprising a second λ/4 wave plate installed between the transmitting body and the light detection unit to convert the circularly polarized beam back into linearly polarized light and provide it to the light detection unit. In claim 1,
The scanning unit,
A polarization splitting double scanning holography system comprising a horizontal scanning mirror and a vertical scanning mirror to control the scanning position of the scan beam with respect to the transmitting body, and controlling the incident scan beam in horizontal and vertical directions to transmit it to the transmitting body. In claim 1,
The scanning unit,
A scanning mirror that controls the scan beam incident from the scan beam splitter in the horizontal direction and transmits it to the transmitting body so as to control the scanning position of the scan beam with respect to the transmitting body in the horizontal and vertical directions, and at the rear end of the transmitting body A polarization-splitting double scanning holography system comprising a translation stage that moves the transmitting body in a vertical direction. In claim 1,
The scanning unit,
a spatial modulation scanner that controls the scan beam incident from the scan beam splitter in the horizontal direction and transmits it to the transmitting body so as to control the scanning position of the scan beam with respect to the transmitting body in the horizontal and vertical directions; A polarization splitting double scanning holography system including a translation stage that moves the transmitting material in the vertical direction at the rear end of the transmitting material. In claim 1,
The scanning unit,
It includes a vertical scanner and a horizontal scanner for controlling the scanning position of the scan beam with respect to the transmitting body in the horizontal and vertical directions, and horizontally controlling the scan beam incident from the scan beam splitter in the horizontal direction to transmit it to the transmitting body. A polarization-splitting double scanning holography system including a spatial modulation scanner and a vertical spatial modulation scanner that controls the scan beam in a vertical direction and transmits it to a transmitting body.

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