CN116560202A - Scanning holographic device for obtaining horizontal parallax hologram only - Google Patents

Scanning holographic device for obtaining horizontal parallax hologram only Download PDF

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Publication number
CN116560202A
CN116560202A CN202310516731.0A CN202310516731A CN116560202A CN 116560202 A CN116560202 A CN 116560202A CN 202310516731 A CN202310516731 A CN 202310516731A CN 116560202 A CN116560202 A CN 116560202A
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hologram
pupil
scanning
light
horizontal parallax
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曹文昊
张永安
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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Priority to CN202310516731.0A priority Critical patent/CN116560202A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H2001/0208—Individual components other than the hologram
    • G03H2001/0216—Optical components
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H2001/0208—Individual components other than the hologram
    • G03H2001/0232—Mechanical components or mechanical aspects not otherwise provided for
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/24—Reflector; Mirror
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/50—Particular location or purpose of optical element
    • G03H2223/55—Arranged at a Fourier plane
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00—Active addressable light modulator
    • G03H2225/30—Modulation
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00—Active addressable light modulator
    • G03H2225/52—Reflective modulator

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Holo Graphy (AREA)

Abstract

The invention discloses a scanning holographic device for obtaining a horizontal parallax hologram only, comprising: focusing lens, light source, pupil, plane reflector, acousto-optic modulator (AOM), two-dimensional scanning galvanometer, cylindrical mirror, horizontal slit; according to the invention, the vertical axis data are compensated by utilizing a cylindrical mirror, then a two-dimensional Fresnel zone plate is processed by using the limiting effect of a horizontal slit, the two-dimensional Fresnel wave representation is converted into a one-dimensional Fresnel zone plate for reducing the curvature of the vertical axis, then the one-dimensional Fresnel zone plate is used for scanning an object, a photoelectric sensor is used for recording light waves, and the recorded data are synthesized by utilizing a computer to obtain a horizontal parallax hologram of the object; the invention has the advantages that: the cost is low, the construction and operation of the optical path are simple, the calculation speed of the hologram is effectively increased, and the anti-interference performance of the optical path of the experimental platform can be increased by using the scanning holographic optical path as a substrate; the one-dimensional Fresnel zone plate is used for scanning, so that the horizontal parallax scanning hologram with good reproduction effect can be obtained while the data volume is reduced.

Description

Scanning holographic device for obtaining horizontal parallax hologram only
Technical Field
The invention relates to a scanning holographic device for obtaining a horizontal parallax hologram only, and belongs to the technical field of holographic optics.
Background
Holography (Optical Holography) is an imaging technique consisting of two parts, recording and reconstruction. The shooting process records object light wave information by utilizing an interference principle, namely: the shot object forms a diffuse object beam under laser irradiation; the other part of laser is used as a reference beam to be emitted onto the holographic negative film, and is overlapped with the object beam to generate interference, so that the phase and the amplitude of each point on the object light wave are converted into the intensity which changes in space, and the whole information of the object light wave is recorded by utilizing the contrast and the interval between interference fringes; the negative film recorded with the interference fringes is processed by developing, fixing and other processing procedures to form a hologram or called hologram; then, the object light wave information is reproduced by utilizing the diffraction principle, namely the imaging process is as follows: the hologram is like a complex optical holographic grating, and under the irradiation of coherent laser, the diffracted light wave of a linear recorded sinusoidal hologram can generally give two images, namely an original image (also called initial image) and a conjugated image. The reproduced image has strong stereoscopic impression and real visual effect. Each part of the hologram records the light information of each point on the object, so that in principle, each part of the hologram can reproduce the whole image of the original object, and a plurality of different images can be recorded on the same negative film through multiple exposure and respectively displayed.
To obtain a high quality large-size hologram, registration and reconstruction of the high quality large-size hologram has been a heavy computational task for computers, and a high quality or large-size hologram requires several billion or more pixels, which results in a large spatial bandwidth product. The large use of spatial bandwidth products severely impacts the storage and manipulation of holograms. In order to lighten the burden of a computer, obtain a large-size or high-quality hologram, according to the characteristic that human eyes are sensitive to horizontal axis parallax but insensitive to vertical axis parallax, the invention provides a hologram with only horizontal parallax, which has a large viewing angle in the x direction, can keep higher quality and simultaneously keep a lower space bandwidth product.
It can be seen that how to obtain a horizontal parallax only hologram becomes the key point of the present invention to achieve a high quality horizontal parallax only hologram.
Disclosure of Invention
Aiming at the restriction of the prior art, the invention aims to provide a method for realizing a scanning holographic device for obtaining only horizontal parallax holograms, which makes up the defects in the prior art.
In order to achieve the above object, the present invention adopts the following technical scheme:
a scanning hologram device for obtaining a horizontal parallax only hologram, characterized by: comprises a laser 1, a beam splitter 2, an acousto-optic modulator 3, a plane mirror 4 and a pupil I5 (p 1 (x, y)), pupil II 17 (denoted p) 2 (x, y)), a Fourier lens I6, a Fourier lens II 18, a Fourier lens III 19, a beam combining lens 7, a cylindrical lens 8, a horizontal slit 9, a two-dimensional scanning galvanometer 10, a scanned object Γ (x, y) 11, a photoelectric sensor PD12, a band-pass filter BPF13, an electron multiplier cos omega t14, an electron multiplier sin omega t20, a low-pass filter 15, a computer 16,
the laser 1 emits a beam of laser light with the frequency omega, and the laser light passes through the spectroscope 2 and then becomes two beams of light with the same frequency; a beam of light (marked as upper light) changes the frequency into (omega+omega) through the acousto-optic modulator 3, and sequentially passes through the plane mirror 4, the pupil II 17 and the Fourier lens III 19 to reach the beam combining mirror 7; the frequency of the other beam of light (marked as lower light) is unchanged and still becomes omega, and the other beam of light sequentially passes through the pupil I5 and the Fourier lens II 18 to reach the beam combining lens 7; two beams of light with different frequencies are modulated through a pupil I5 and a pupil II 17, interference is generated at the position of a beam combining lens 7, and an interference pattern is a Fresnel wave band ring; the interference light is processed through a cylindrical mirror 8 and a rectangular horizontal slit 9 to obtain a narrow-band Fresnel zone plate with approximate one-dimensional curvature, and then a two-dimensional scanning galvanometer 10 is used for scanning the interference light on a target object Γ (x, y) 11; the light containing the object amplitude information propagates through the fourier lens i 6 to the photosensor PD12, generating an electrical signal i (x, y) related to the object amplitude information; the electric signal i (x, y) sequentially passes through the band-pass filter BPF13, the electronic multiplier cos Ω t14, the electronic multiplier sin Ω t20 and the low-pass filter 15 to enter the computer 16, and the computer 16 performs image recording, reproduction and post-processing on the electric signal i (x, y).
Preferably, the pupil function of the pupil I5 according to the invention is set to p 1 (x, y) =δ (x, y), the pupil function of pupil ii 17 is set to p 2 (x,y)＝1。
Preferably, the pupil I5 of the present invention is located on the front focal plane of the Fourier lens II 18, and the pupil II 17 is located on the front focal plane of the Fourier lens III 19.
Preferably, the two-dimensional scanning galvanometer 10 of the invention is positioned at the back focal plane of the Fourier lens I6 and the Fourier lens II 18.
Preferably, the beam splitter 2 has a beam splitting ratio of 1:1.
The principle of the invention is as follows:
let the primary phases of two light fields of the laser beam split by the beam splitter 2 be the same, define the propagation direction of the light as z, the propagation distance of the light as z, define x and y coordinates according to the Cartesian coordinate system method, define the propagation time of the laser source as t, then the expressions are:
in the method, in the process of the invention,complex light field representing upper light, +.>A complex optical field representing lower light, a representing the amplitude of upper light, B representing the amplitude of lower light, j representing imaginary units, ω representing the frequency of the laser light, Ω representing the heterodyne frequency of the acousto-optic modulator,
wherein the upper light passes through the acousto-optic modulator 3, the frequency becomes ω+Ω; the frequency of the lower light is still omega, and if two lights directly interfere at the moment, the generated interference light field can be expressed as:
the PD is then used to receive the optical signal, and the electrical signal i generated by the photosensor is related only to the amplitude of the optical signal, namely:
the equation contains amplitude and phase related information, which is the advantage of optical heterodyning.
It is now known that a transparent object t (x, y) located at the front d of a convex lens with a focal length f is illuminated by plane waves as shown in fig. 2, from which it can be seen that the planar light irradiates the transparent object t (x, y) and then passes through the convex lens and is imaged at the back focal plane.
The calculation block diagram is shown in fig. 3, and it can be seen from the figure that the transparent object t (x, y) reaches the lens after diffraction, and continues the calculation flow of diffraction to the back focal plane after phase modulation of the lens.
Wherein the method comprises the steps ofIt can be derived that:
ψ p (x,y；f)＝{[t(x,y)*h(x,y；d)]t f (x,y)}*h(x,y；f) (5)
wherein "×" denotes convolution operation, ψ p (x, y; f) represents complex light field information of the back focal plane of the lens, t f (x, y) denotes the phase factor of the lens, h (x, y; d) denotes the fresnel diffraction point spread function at a distance d, h (x, y; f) denotes the fresnel diffraction point spread function at a distance f, k denotes the wave number of light, and after ignoring part of the constants, the above formula can be written as:
in the optical path of the present invention, taking the case of d=f, the above equation becomes by ignoring some constants:
k y ＝k y /f
k in x ，k y Representing the coordinates in the frequency domain,representing complex light field information of t (x, y) after passing through the system of FIG. 2, and the same applies to P 1 P 2 Represents p 1 p 2 Complex light field information after passing through the system of fig. 2; the two light beams respectively pass through the pupil p can be obtained by the method (7) 1 (x,y)、p 2 After (x, y) and lenses L1, L2, the light field +.> Respectively denoted as
Two beams are at BS 2 After the position is interfered, the synthesized interference light field expressionCan be expressed as:
the two-dimensional fresnel zone plate is formed, and the fresnel zone plate is processed to be converted into an approximately one-dimensional narrow-band fresnel zone plate, and a schematic pattern of the processed approximately one-dimensional narrow-band fresnel zone plate can be seen from the figure as shown in fig. 3.
As shown in fig. 3, the present invention uses a narrow-band fresnel zone plate with approximately one-dimensional curvature-free to replace a two-dimensional fresnel zone plate in Optical Scanning Holography (OSH) to scan a target three-dimensional object, in simulation, the present invention uses a method of interference of plane waves and spherical waves to obtain a required two-dimensional fresnel zone plate, and then uses a cylindrical mirror with large curvature to make the two-dimensional fresnel zone plate eliminate the curvature of the Y-axis, so as to obtain data compensation of the Y-axis, thus effectively increasing the on-line effect of holographic vertical axis direction, and the following formula:
then processing by using a two-dimensional window function, limiting the vertical axis data to obtain an approximate one-dimensional narrow-band Fresnel zone plate which keeps the complete state of the X axis and discards most of data on the Y axis
Where rect denotes the window function, 1/η determines the extent of 1D FZP in the vertical direction,a light field expression representing the processed approximately one-dimensional narrow-band fresnel zone plate.
Then, eliminating the curvature of the Y axis, and after the window function rect treatment, the approximate one-dimensional narrow-band Fresnel zone plate can be expressed as:
wherein the method comprises the steps ofRepresenting the light field expression of the processed one-dimensional-like narrow-band fresnel zone plate.
The object at the vibrating mirror z is scanned by using the interference light scanning distance, and the current signal output by the photoelectric sensor PD is:
wherein Γ represents the transmittance function of the object, x ', y' represents the coordinates on the surface of the photosensor PD, and the electrical signal is filtered by a BPF with a center frequency of iΩ and takenReal part, the resulting current signal i Ω The method comprises the following steps:
where Re represents the real part of the bracketed complex function,representing P 1 The above equation reflects the relationship between the input signal and the output signal in the whole system, if i is set Ω (x,y；z；t)＝Re(i Ωp (x,y；z；t)·e jΩt ) Wherein The optical transfer function (Optical Transfer Function, OTF) can be expressed as:
when the pupil function is set to p 1 (x,y)＝δ(x,y)，p 2 When (x, y) =1, it is possible to obtain:
where "×" denotes the convolution operation, from equation (12), the resulting electrical signal can be expressed as:
the current signal passing through a modulatorThen, the signals are respectively extracted into real parts i by sin (Ω t) and cos (Ω t) cos And imaginary part i sin Two parts:
where Im represents the imaginary part, H, of the bracketed complex function cos And H is sin Representing cos hologram and sin hologram, respectively; combining the two formulas to obtain the composite hologram H HPO (x, y; z) is:
the method comprises the steps of (1) obtaining a hologram which is approximately one-dimensional and is formed by interference between a narrow-band Fresnel zone plate and a three-dimensional object and contains only horizontal parallax information of the object, and finally, obtaining the reproduction effect by reproducing the obtained hologram by using reference light.
The hologram recorded in the invention (21) is referred to herein as a horizontal parallax only hologram; since the recorded hologram is a pattern of encoding with only horizontal parallax between the intensity of the object and the approximately one-dimensional narrow-band FZP, the present invention can directly obtain only horizontal parallax scanning holograms required by the present invention; at the same time, the hologram is obtained by scanning the hologram, so that the hologram can reconstruct a three-dimensional image of the target without double image noise; to reduce the amount of data required, the present invention converts a full parallax hologram to a Horizontal Parallax Only (HPO) hologram using a near one-dimensional narrow-band fresnel zone plate for scanning, proposes an HPO hologram for 3D display; the present invention recognizes that this can be an excellent way to reduce the amount of data required for 3D display; the full parallax holograms of the 3D object may be considered as a set of 2D FZPs, while the HPO holograms are a set of 1D FZPs; accordingly, the HPO hologram may be considered as an object whose intensity is encoded with 1D FZP.
Regarding the reproduction procedure of the hologram image, for the hologram image that has been recorded, if the target object is at a distance z from the scanning galvanometer z, the reproduction image I (x, y; z) can be expressed as:
I(x,y；z)＝H HPO (x,y；z)*h(x,y；z) (22)
i.e., the convolution of the hologram with the fresnel transfer function in space domain, where h (x, y; z) represents the fresnel diffraction point spread function at z; simultaneous cos hologram I cos (x, y; z) and sin holograms I sin (x, y; z) can be expressed as:
I cos (x,y；z)＝H cos (x,y；z)*h(x,y；z) (23)
I sin (x,y；z)＝H sin (x,y；z)*h(x,y；z) (24)
the invention has the beneficial effects that:
the device has low cost, simple construction and operation of the optical path, effectively increases the calculation speed of the hologram, and can increase the anti-interference performance of the optical path of the experimental platform by using the scanning holographic optical path as a substrate; the one-dimensional Fresnel zone plate is used for scanning, so that the horizontal parallax scanning hologram with good reproduction effect can be obtained while the data volume is reduced.
Drawings
FIG. 1 is a light path diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a plane wave illumination situation;
FIG. 3 is a block diagram of a plane wave illumination calculation;
fig. 4 is a schematic diagram of an approximately one-dimensional narrow-band fresnel zone plate.
In the figure: 1-a laser; 2-beam splitters; a 3-acousto-optic modulator; 4-plane mirror; 5-pupil I; 6-fourier lens i; 7-beam combining lenses; 8-a cylindrical mirror; 9-horizontal slits; 10-two-dimensional scanning galvanometer; 11-scanned object Γ (x, y); 12-photosensor PD; 13-a band-pass filter BPF; 14-electronic multiplier cos Ω; 15-a low pass filter; 16-a computer; 17-pupil II; 18-fourier lens ii, 19-fourier lens iii; 20-electronic multiplier sin Ω t.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings and by way of examples in order to make the objects, technical solutions and advantages of the invention more apparent.
Example 1
A scanning hologram device for obtaining only horizontal parallax hologram, as shown in figure 1, comprises a laser 1, a beam splitter 2, an acousto-optic modulator 3, a plane mirror 4, a pupil I5 (denoted as p 1 (x, y)), pupil II 17 (denoted p) 2 (x, y)), a fourier lens i 6, a fourier lens ii 18, a fourier lens iii 19, a beam combining lens 7, a cylindrical lens 8, a horizontal slit 9, a two-dimensional scanning galvanometer 10, a scanned object Γ (x, y) 11, a photoelectric sensor PD12, a band-pass filter BPF13, an electronic multiplier cos Ω t14, an electronic multiplier sin Ω t20, a low-pass filter 15, a computer 16, and a laser 1 emits a laser beam with a frequency ω, and after passing through a spectroscope 2, the laser beam becomes two same-frequency lights; a beam of light changes the frequency into (omega+omega) through the acousto-optic modulator 3, and sequentially passes through the plane mirror 4, the pupil II 17 and the Fourier lens III 19 to reach the beam combining mirror 7; the frequency of the other beam of light is still omega, and the other beam of light sequentially passes through the pupil I5 and the Fourier lens II 18 to reach the beam combining lens 7; two beams of light with different frequencies are modulated through a pupil I5 and a pupil II 17, interference is generated at the position of a beam combining lens 7, and an interference pattern is a Fresnel wave band ring; the interference light is processed through a cylindrical mirror 8 and a rectangular horizontal slit 9 to obtain a narrow-band Fresnel zone plate with approximate one-dimensional curvature, and then a two-dimensional scanning galvanometer 10 is used for scanning the interference light on a target object Γ (x, y) 11; the light containing the object amplitude information propagates through the fourier lens i 6 to the photosensor PD12, generating an electrical signal i (x, y) related to the object amplitude information; the electric signal i (x, y) sequentially passes through a band-pass filter BPF13, an electronic multiplier cos omega t14, an electronic multiplier sin omega t20 and a low-pass filter 15 to enter a computer 16, the computer 16 tunes heterodyne frequency omega through a band-pass filter firstly, and heterodyne current is extracted for filtering the current baseband; heterodyning is currently split into two channels and two outputs are obtained: ic and is integrated circuit together, by cosine or sine input signal and heterodyne frequency of electron multiplication, then extract heterodyne current of stage with the low-pass filter; the invention stores the heterodyne current in the computer to obtainHorizontal parallax only holograms without double image noise.
As a preferred embodiment of the invention, the pupil i 5 is located at the front focal plane of the fourier lens ii 18, and the pupil ii 17 is located at the front focal plane of the fourier lens iii 19.
As a preferred embodiment of the present invention, the two-dimensional scanning galvanometer 10 is positioned at the back focal plane of fourier lens i 6, ii 18.
In a preferred embodiment of the present invention, the splitting ratio of the beam splitter 2 is 1:1.
Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the invention, and that, although the invention has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.

Claims (6)

1. A scanning hologram device for obtaining a horizontal parallax only hologram, characterized by: comprises a laser (1), a beam splitter (2), an acousto-optic modulator (3), a plane mirror (4), a pupil I (5), a pupil II (17), a Fourier lens I (6), a Fourier lens II (18), a Fourier lens III (19), a beam combining mirror (7), a cylindrical mirror (8), a horizontal slit (9), a two-dimensional scanning galvanometer (10), a scanned object Γ (x, y) (11), a photoelectric sensor PD (12), a band-pass filter BPF (13), an electronic multiplier cos omega t (14), an electronic multiplier sin omega t (20), a low-pass filter (15) and a computer (16),
the laser (1) emits a beam of laser with the frequency omega, and the laser passes through the spectroscope (2) and then becomes two beams of light with the same frequency; a beam of light changes the frequency into (omega+omega) through the acousto-optic modulator (3), and sequentially passes through the plane mirror (4), the pupil II (17) and the Fourier lens III (19) to reach the beam combining mirror (7); the frequency of the other beam of light is still omega, and the other beam of light sequentially passes through the pupil I (5) and the Fourier lens II (18) to reach the beam combining lens (7); two beams of light with different frequencies pass through a pupil I (5) and a pupil II (17) to finish modulation, interference is generated at the position of a beam combining lens (7), and an interference pattern is a Fresnel wave band ring; the interference light is processed through a cylindrical mirror (8) and a rectangular horizontal slit (9) to obtain a curvature-free narrow-band Fresnel zone plate, and then a two-dimensional scanning galvanometer (10) is used for scanning the interference light on a target object Γ (x, y) (11); light containing the object amplitude information propagates through the fourier lens i (6) to the photosensor PD (12), generating an electrical signal i (x, y) related to the object amplitude information; the electric signal i (x, y) sequentially passes through a band-pass filter BPF (13), an electronic multiplier cos omega t (14), an electronic multiplier sin omega t (20) and a low-pass filter (15) to enter a computer (16), and the computer (16) records, reproduces and post-processes the image of the electric signal i (x, y) to finally obtain the horizontal parallax hologram without double image noise.
2. Scanning holographic device for obtaining a horizontal parallax only hologram according to claim 1, wherein: the pupil function of pupil I (5) is set to p 1 (x, y) =δ (x, y), the pupil function of pupil ii (17) is set to p 2 (x,y)＝1。
3. Scanning holographic device for obtaining a horizontal parallax only hologram according to claim 1, wherein: the pupil I (5) is located on the front focal plane of the Fourier lens II (18), and the pupil II (17) is located on the front focal plane of the Fourier lens III (19).
4. Scanning holographic device for obtaining a horizontal parallax only hologram according to claim 1, wherein: the two-dimensional scanning galvanometer (10) is positioned at the back focal planes of the Fourier lens I (6) and the Fourier lens II (18).
5. Scanning holographic device for obtaining a horizontal parallax only hologram according to claim 1, wherein: the beam splitting ratio of the beam splitter (2) is 1:1.
6. Scanning holographic device for obtaining a horizontal parallax only hologram according to claim 1, wherein: hologram H HPO The expression of (x, y; z) is:
wherein: defining the propagation direction of light as z, defining x and y coordinates respectively according to Cartesian coordinate system, j as imaginary unit, k as wave number of light, rect as window function, 1/η determining the range of 1D FZP along vertical direction, H cos And H is sin Representing cos hologram and sin hologram, respectively, Γ (x, y; z) being a transmittance function, k, comprising information of the target object x ，k y Representing the coordinates in the frequency domain,is an inverse fourier transform form of the Optical Transfer Function (OTF).
CN202310516731.0A 2023-05-09 2023-05-09 Scanning holographic device for obtaining horizontal parallax hologram only Pending CN116560202A (en)

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