CN216133257U - Vector light field generating device based on polarization holographic technology - Google Patents
Vector light field generating device based on polarization holographic technology Download PDFInfo
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- CN216133257U CN216133257U CN202122027356.2U CN202122027356U CN216133257U CN 216133257 U CN216133257 U CN 216133257U CN 202122027356 U CN202122027356 U CN 202122027356U CN 216133257 U CN216133257 U CN 216133257U
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Abstract
The utility model relates to a vector light field generating device based on a polarization holographic technology, which comprises a laser, a polarization beam splitting system, a reflector group, a vector light field adjusting system, an image acquisition unit and a polarization recording material, wherein the laser is used for emitting a polarized light beam; the laser is used for generating a light source; the polarization beam splitting system is used for splitting an incident light source into reference light and signal light, the polarization directions of which are orthogonal, the reference light is in a p polarization state, and the signal light is in any linear polarization state; the reflector group is used for mutually and vertically irradiating the reference light and the signal light which are separated by the polarization beam splitting system into the polarization recording material; the vector light field adjusting system is used for regulating and controlling signal light to generate different vector light fields; the polarization recording material is used for carrying out polarization recording on incident reference light and signal light to form a polarization hologram; the image acquisition unit is used for detecting the intensity distribution of the vector light field of the polarization hologram. No specially designed optical element is needed, the structure is simple, the operation is convenient and the generation speed is high.
Description
Technical Field
The utility model relates to the field of photoelectric technology, in particular to a vector light field generating device based on polarization holographic technology.
Background
The generation method of the vector light field is one of the research hotspots at home and abroad. At present, a large number of methods for generating vector light fields have been proposed. Methods for generating vector light fields can be generally classified into two types, active methods and passive methods. The active method is to directly output vector beams by designing a resonant cavity of a laser; passive methods are to insert some device in the external optical path of the laser to change the polarization state of the output beam of the laser, thereby generating a vector optical field. Active methods can produce vector light fields more efficiently but lack flexibility. The resonant cavity is specially designed to generate only vector light fields distributed in specific polarization states, and the passive method can more conveniently generate vector light fields distributed in various polarization states. The passive method can be divided into a direct method and an indirect method: the direct method is that a linear polarized light beam output by a laser is directly converted into a vector beam through a specially designed optical element, such as a sub-wavelength grating, a phase optical element, a super surface, liquid crystal and the like; the indirect method is mainly that a vector light field is formed by coaxially overlapping multiple beams, so the method is also called as an interference method. The traditional passive generation method of the vector light field needs an optical element with special design, needs to coaxially superpose multiple beams, and has complex structure, inconvenient operation and low speed. For example, an axisymmetric twisted nematic liquid crystal (ASTNLC) device prepared based on an axisymmetric photo-alignment technique is disclosed in an article (Polarization converters based on axialily symmetric structured liquid crystal [ J ]. Optics EXPRESS,2010,18(4): 3601) -3607 published in "OptiCAL EXPRESS" 2010, which has a complicated structure and is inconvenient to operate, and the generation time of the method needs 60min and the temperature needs to be controlled.
SUMMERY OF THE UTILITY MODEL
Therefore, a vector light field generating device based on the polarization holography technology needs to be provided, and the problems that an optical element with special design is needed for generating the existing vector light field, the structure is complex, the operation is inconvenient, the generating speed is slow and the like are solved.
In order to achieve the above object, the inventor provides a vector light field generating device based on polarization holography, comprising a laser, a polarization beam splitting system, a reflector group, a vector light field adjusting system, an image collecting unit and a polarization recording material;
the laser is used for generating a light source and emitting the light source into the polarization beam splitting system;
the polarization beam splitting system is used for splitting an incident light source into reference light and signal light, the polarization directions of which are orthogonal, the reference light is in a p polarization state, and the signal light is in any linear polarization state;
the reflector group is used for mutually and vertically irradiating the reference light and the signal light which are separated by the polarization beam splitting system into the polarization recording material;
the vector light field adjusting system is arranged on a propagation path of the signal light and used for adjusting and controlling the signal light to generate different vector light fields;
the polarization recording material is used for carrying out polarization recording on incident reference light and signal light to form a polarization hologram;
the image acquisition unit is used for detecting the intensity distribution of the vector light field of the polarization hologram.
Further optimizing, still include first lens, first lens setting is between laser instrument and polarization beam splitting system, first lens is used for the divergent light beam collimation of laser instrument as parallel light beam, and the expand beam.
Further preferably, the reflector group comprises a first reflector and a second reflector;
the first reflector is used for reflecting the reference light so that the reference light is incident into the polarization recording material;
the second reflecting mirror is configured to reflect the signal light such that the signal light is incident on the polarization recording material.
Further optimizing, the vector light field adjusting system comprises a half-wave plate, a fan-shaped slit, a first rotating mechanism and a second rotating mechanism;
the half-wave plate is arranged on the first rotating mechanism, and the fan-shaped slit is arranged on the second rotating mechanism;
the first rotating mechanism and the second rotating mechanism are used for generating vector light fields with different orders through the ratio of the rotation angle of the half-wave plate to the relative speed of the azimuth alignment of the fan-shaped slit.
Further preferably, the fan-shaped slits are composed of two fan-shaped slits, and the fan-shaped slits are used for adjusting the relative size between the two fan-shaped slits so as to adjust the exposure area and the exposure amount.
Further optimization, the polarization beam splitter further comprises a 4f optical system, wherein the 4f optical system comprises a second lens and a third lens, and the second lens and the third lens are arranged between the vector light field adjusting system and the polarization recording material;
the 4f optical system is used to transfer polarization and phase information of the fan-shaped slit position to the polarization recording material.
Further preferably, the laser is a He-Ne laser having a wavelength λ of 532 nm.
Further preferably, the polarization recording material further comprises a fourth lens, and the fourth lens is arranged between the polarization recording material and the image acquisition unit.
Further optimization, the device also comprises a spatial filter, and the spatial filter is arranged between the laser and the polarization beam splitting system.
Different from the prior art, the technical scheme is that the laser emits linearly polarized light beams, and the linearly polarized light beams are emitted into the polarization beam splitting system and divided into two linearly polarized light beams with orthogonal polarization directions: reference light and signal light; the reference light and the signal light are vertically incident into the polarization recording material through the reflector group to be interfered with each other to record a polarization hologram, the reference light is p-polarized during recording, the signal light is any linearly polarized light, and the hologram is reproduced by the reference light after being recorded. The reference light is directly incident on the polarization recording material, the signal light generates different vector light fields through the vector light field adjusting system and then is incident on the polarization recording material, a polarization hologram is further formed, and then the vector light field intensity distribution of the polarization hologram formed by the polarization recording material is detected through the image acquisition unit. The optical element through special design is not needed, and the experimental device is simple in structure, convenient to operate and high in generation speed.
Drawings
Fig. 1 is a schematic structural diagram of a vector light field generation device based on polarization holography according to an embodiment.
FIG. 2 is a schematic diagram of a fan-shaped slit according to an embodiment;
FIG. 3 is a schematic diagram of the matching between the half-wave plate and the fan-shaped slit according to the embodiment;
FIG. 4 is a schematic diagram of a first order vector light image according to an embodiment;
fig. 5 is a schematic diagram of a second order vector light image according to an embodiment.
Description of reference numerals:
1. laser, 2, spatial filter, 3, first lens, 4, polarization beam splitting system, 5, first mirror, 6, second mirror, 7, half-wave plate, 8, fan-shaped slit, 9, second lens, 10, third lens, 11, polarization recording material, 12, fourth lens, 13, CMOS camera.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the present embodiment provides a polarization holographic vector light field generating device, which includes a laser 1, a polarization beam splitting system 4, a mirror group, a vector light field adjusting system, a polarization recording material 11, and an image collecting unit 13;
the laser 1 is used for generating a light source and emitting the light source into the polarization beam splitting system 4; the laser 1 is a He-Ne laser 1 with a wavelength λ of 532nm, and the polarization beam splitting system 4 is a polarization beam splitter, in other embodiments, the laser 1 with other wavelengths may be used, and the laser 1 is used to generate a linearly polarized light beam.
The polarization beam splitting system 4 is used for splitting an incident light source into reference light and signal light with orthogonal polarization directions; the polarization beam splitting system 4 splits an incident beam into two linearly polarized light beams whose polarization directions are orthogonal. The polarization beam splitting system adopts a polarization beam splitting prism.
The reflector group is used for mutually and vertically irradiating the reference light and the signal light which are split by the polarization beam splitting system 4 into the polarization recording material 11; wherein the reflector group comprises a first reflector 5 and a second reflector 6; the first reflector 5 is used for reflecting the reference light so that the reference light is incident into the polarization recording material 11; the second reflecting mirror 6 is used to reflect the signal light so that the signal light is incident on the polarization recording material 11. The reference light is reflected by the first reflecting mirror 5, and the signal light is reflected by the second reflecting mirror 6, respectively, so that the reference light and the signal light are incident on the polarization recording material 11 perpendicularly to each other.
The vector light field adjusting system is arranged on a propagation path of the signal light and used for adjusting and controlling the signal light to generate different vector light fields;
the polarization recording material 11 is used for performing polarization recording on incident reference light and signal light to form a polarization hologram and then the polarization hologram is incident into the image acquisition unit 13; in the present embodiment, bulk PQ/PMMA material is used as the polarization recording material, and the size is about 10mm by 30mm, which is used for polarization recording.
The image acquisition unit 13 is configured to detect an intensity distribution of a vector light field of the polarization hologram. The image acquisition unit 13 employs a CMOS camera, and in other embodiments, other cameras may be employed to acquire the intensity distribution of the vector light field.
The laser 1 emits a linearly polarized light beam, and the linearly polarized light beam is emitted into a polarization beam splitting system 4 and is divided into two linearly polarized light beams with orthogonal polarization directions: reference light and signal light; the reference light and the signal light are vertically incident into the polarization recording material 11 through the reflector group to perform interference recording on the polarization hologram, the reference light is p-polarized during recording, the signal light is any linearly polarized light, and the hologram is reproduced by the reference light after recording. Wherein, the reference light directly incides on polarization recording material 11, and the signal light passes through vector light field governing system and generates different vector light fields and incides on polarization recording material 11 to generate the polarization hologram, survey the polarization hologram through image acquisition unit 13 and can obtain the intensity distribution condition of vector light field. The optical element which is specially designed is not needed, and the adopted testing device has simple structure, convenient operation and high generation speed. The vector light field can be generated only in a few minutes by the device, and is independent of temperature.
The polarization recording characteristic based on the faithful reproduction of linearly polarized light in polarization holography is adopted, in polarization holography, the s-polarization direction is defined to be parallel to the Y-axis direction of a coordinate system, and the p-polarization direction is defined to be perpendicular to the propagation direction of light waves in an X-Z plane. Wherein, the signal light is in any linear polarization state of alpha s + beta p+The reference light is p-polarized, and the interference angle is 90 °:
the faithful reproduction based on linearly polarized light in polarization holography is as follows:
as can be seen from the above table, when the recording and reproducing reference light has a uniform polarization state at an interference angle of 90 °, the polarization state of the signal light can be faithfully reproduced.
Wherein. A spatial filter 2 is arranged between the laser 1 and the polarization beam splitting system 4, and the spatial filter 2 is used for filtering a light source emitted by the laser 1, removing dust attached to the laser 1 or wave surface deformity caused by a reflecting mirror surface, and obtaining more ideal spherical waves.
In this embodiment, the laser further includes a first lens 3, the first lens 3 is disposed between the laser 1 and the polarization beam splitting system 4, and the first lens 3 is configured to collimate and expand the diverging light beam of the laser 1 into a parallel light beam. A first lens 3 is arranged between a laser 1 and a polarization beam splitting system 4, so that divergent beams of a light source are collimated to form parallel beams, the beams are expanded, and then the parallel beams are incident into the polarization beam splitting system 4.
In this embodiment, the vector light field adjusting system includes a half-wave plate 7, a fan-shaped slit 8, a first rotating mechanism and a second rotating mechanism;
the half-wave plate 7 is arranged on a first rotating mechanism, and the first rotating mechanism is used for driving the half-wave plate 7 to rotate, so that the polarization state of the half-wave plate 7 is twice of the rotating angle;
the fan-shaped slit 8 is provided on the second rotating mechanism.
The half-wave plate 7 is arranged on the first rotating mechanism, the fan-shaped slit 8 is arranged on the second rotating mechanism to form a dynamic exposure regulation and control system, and the polarization state theta passing through the half-wave plate 7HIs the angle of rotation thereof
Twice, vector light fields of different orders are generated by the ratio of the rotation angle of the half-wave plate 7 to the relative speed of the azimuthal alignment of the fan-shaped slits 8, wherein the fan-shaped slits 8 are formed by combining two fan-shaped slits as shown in fig. 2, and the fan-shaped slits act to adjust the relative sizes of the two so as to adjust the exposure area and the exposure amount. The device also comprises a 4f optical system, wherein the 4f optical system comprises a second lens 9 and a third lens 10, and the second lens 9 and the third lens 10 are arranged between the dynamic exposure regulation system and the polarization recording material 11; the 4f optical system is used to transfer the polarization and phase of the fan-shaped slit 8 position to the polarization recording material 11. The second lens 9 and the third lens 10 are combined into a 4f optical system, so that information such as the polarization and phase at the position of the fan-shaped slit 8 can be perfectly transmitted to the polarization recording material 11 as a recorded signal light.
In this embodiment, a linearly polarized light beam is emitted from the laser 1, and is expanded and collimated by the light beam expanding system, wherein the light beam expanding system employs a first lens, the linearly polarized light beam is expanded and collimated by the first lens, and then is divided into two mutually orthogonal linearly polarized light beams by the light beam splitting system, the rotating speeds of the fan-shaped slit and the half-wave plate are respectively adjusted by the dynamic exposure regulation and control system, and the two light beams interfere and record a polarization hologram in the polarization recording material 11 at an included angle of 90 °. During recording, the reference light is p-polarized, the signal light is any linearly polarized light, after the polarization hologram is recorded, the polarization hologram is reproduced by taking the p-polarized light as a reproduction light wave, and finally, the intensity distribution of the formed vector light field is detected by the image acquisition unit 13.
As shown in FIG. 3, the polarization state of the vector beam can be expressed as
(phi is the polar angle of the polar coordinate system, m is the topological charge number, theta0Is described in
A constant of the initial polarization state of time).
When s-polarization passes through the half-wave plate, the jones matrix of the emerging light can be expressed as:
so that the polarization state of the vector beam can be expressed as
(θHIs the polarization state after passing through the half-wave plate), the initial polarization state theta of the half-wave plate is adjusted and controlled0And the ratio of the relative velocities between the half-wave plate and the fan-shaped slit can be achieved0Different arbitrary order vector light.
The device also comprises a fourth lens 12, wherein the fourth lens 12 is arranged between the polarization recording material 11 and the image acquisition unit 13, and the fourth lens 12 is used for forming an equi-large inverted image of the polarization hologram on the image acquisition unit 13; the polarized hologram CMOS camera is formed with an equi-large inverted image by the fourth lens 12, and the resulting vector beam is finally detected on the CMOS camera.
For example, to generate a first order vector light field,then m is equal to 1, and m is equal to 1,
adjusting the mechanical rotation speed of the fan-shaped slit to be twice of that of the half-wave plate, and setting the fan-shaped slit and the half-wave plate to simultaneously rotate for one circle at a constant speed in the interference recording process of the reference light and the signal light; after recording a polarized hologram on the polarization recording material, the hologram is reproduced. The first order vector light field image shown in fig. 4 is generated, and the analyzing result shows that the generated light field is the first order vector light field. To generate a second-order vector light field, m is 2, θp＝θH+θ0Adjusting the mechanical rotation speed of the fan-shaped slit to be consistent with that of the half-wave plate, and setting the slit and the half-wave plate to simultaneously rotate for one circle at a constant speed in the interference recording process of the reference light and the signal light; after recording a polarized hologram on the polarization recording material, the hologram is reproduced. A second order vector light field image as shown in fig. 5 is generated, and the analyzing result shows that the generated light field is a second order vector light field.
It should be noted that, although the above embodiments have been described herein, the utility model is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present patent.
Claims (4)
1. A vector light field generating device based on polarization holography is characterized by comprising a laser, a polarization beam splitting system, a reflector group, a vector light field adjusting system, an image collecting unit and a polarization recording material;
the laser is used for generating a light source and emitting the light source into the polarization beam splitting system;
the polarization beam splitting system is used for splitting an incident light source into reference light and signal light, the polarization directions of which are orthogonal, the reference light is in a p polarization state, and the signal light is in any linear polarization state;
the reflector group is used for mutually and vertically irradiating the reference light and the signal light which are separated by the polarization beam splitting system into the polarization recording material;
the vector light field adjusting system is arranged on a propagation path of the signal light and used for adjusting and controlling the signal light to generate different vector light fields;
the polarization recording material is used for carrying out polarization recording on incident reference light and signal light to form a polarization hologram;
the image acquisition unit is used for detecting the intensity distribution of the vector light field of the polarization hologram.
2. The polarization holography-based vector light field generating device of claim 1, wherein the mirror group comprises a first mirror and a second mirror;
the first reflector is used for reflecting the reference light so that the reference light is incident into the polarization recording material;
the second reflecting mirror is configured to reflect the signal light such that the signal light is incident on the polarization recording material.
3. The polarization holography based vector light field generating device according to claim 1, wherein the vector light field adjusting system comprises a half-wave plate, a fan-shaped slit, a first rotating mechanism and a second rotating mechanism;
the half-wave plate is arranged on the first rotating mechanism, and the fan-shaped slit is arranged on the second rotating mechanism;
the first rotating mechanism and the second rotating mechanism are used for generating vector light fields with different orders through the ratio of the rotation angle of the half-wave plate to the relative speed of the azimuth alignment of the fan-shaped slit.
4. The polarization holography-based vector light field generating apparatus of claim 3, wherein the fan-shaped slits are composed of two fan-shaped slits, and the relative size between the two fan-shaped slits is adjusted to adjust the exposure area and the exposure amount.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115826224A (en) * | 2022-12-06 | 2023-03-21 | 福建师范大学 | Scalar vortex light beam generation system and method based on holographic technology |
| CN116107096A (en) * | 2022-12-06 | 2023-05-12 | 福建师范大学 | Device and method for generating vector, scalar vortex and vector vortex light beams |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115826224A (en) * | 2022-12-06 | 2023-03-21 | 福建师范大学 | Scalar vortex light beam generation system and method based on holographic technology |
| CN116107096A (en) * | 2022-12-06 | 2023-05-12 | 福建师范大学 | Device and method for generating vector, scalar vortex and vector vortex light beams |
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