CN111399356A - Color holographic display system with low speckle noise - Google Patents
Color holographic display system with low speckle noise Download PDFInfo
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- CN111399356A CN111399356A CN202010410454.1A CN202010410454A CN111399356A CN 111399356 A CN111399356 A CN 111399356A CN 202010410454 A CN202010410454 A CN 202010410454A CN 111399356 A CN111399356 A CN 111399356A
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- 238000003491 array Methods 0.000 claims abstract description 3
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 230000004075 alteration Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 claims description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
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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
- G03H1/0005—Adaptation of holography to specific applications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/10—Processes or apparatus for producing holograms using modulated reference beam
- G03H1/12—Spatial modulation, e.g. ghost imaging
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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
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
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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
- G03H1/0005—Adaptation of holography to specific applications
- G03H2001/0088—Adaptation of holography to specific applications for video-holography, i.e. integrating hologram acquisition, transmission and display
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Abstract
The invention provides a color holographic display system with low speckle noise. The system consists of three lasers, a wavelength selector, a beam splitting lens group I, a beam splitting lens group II, a beam expander, a micro-lens array group, a spectroscope, a spatial light modulator, a light detector group and a receiving screen. Among them, a red laser, a green laser and a blue laser are used to provide three primary color parallel coherent light beams. A wavelength selector is arranged behind the propagation paths of the three beams of parallel light, and the light beams pass through the wavelength selector and then pass through a beam splitter group I; the beam expander is positioned between the beam splitter group II and the micro lens array group. The micro lens array group consists of two micro lens arrays and a Fourier lens, and homogenizes light beams to reduce the coherence of light sources. The beam splitter is positioned between the spatial light modulator and the receiving screen, the beam after being split passes through the micro-lens array group and the beam splitter mirror and then is vertically incident to the working area of the spatial light modulator, and when the hologram is loaded on the spatial light modulator, a color holographic reconstruction image with low speckle noise can be seen on the receiving screen.
Description
One, the technical field
The invention belongs to holographic display technology, and particularly relates to a color holographic display system with low speckle noise.
Second, background Art
The holographic display technology can reproduce complete wave front information of an object, realizes a vivid 3D display effect, does not need any auxiliary equipment worn by a viewer, and is considered as the most ideal 3D display technology. With the continuous development of holographic display technology, high-quality color holographic display has become one of the research hotspots of people. In the holographic display technology, a coherent light source is used for reproduction, so that severe speckle noise exists in a holographic reproduction image, and the display quality is affected. The color holographic display requires fusion of three color reproduction images of red, green and blue, and the difference of the reproduction light wavelength can cause chromatic aberration and reduce the quality of the holographic reproduction image. For speckle noise, current solutions mainly include reducing the reproduced astigmatism speckle noise by improving the hologram algorithm and reducing the coherence of the light source by optimizing the light source. However, individually improved hologram algorithms introduce new problems, such as high requirements on computer performance and refresh rate of spatial light modulators; although the speckle noise can be reduced by optimizing the light source, the definition of the reproduced image is seriously reduced. How to realize color holographic display with low speckle noise and other performance simultaneously becomes one of the problems to be solved urgently in holographic display at the present stage.
Third, the invention
The invention provides a color holographic display system with low speckle noise. As shown in fig. 1, the system includes three lasers, a wavelength selector, a beam splitter group I, a beam splitter group II, a beam expander, a microlens array group, a beam splitter, a spatial light modulator, a computer, a light detector group, and a receiving screen. Wherein, the red laser, the green laser and the blue laser are used for providing three primary color coherent light sources, and emitted light beams are arranged in parallel. A wavelength selector is arranged behind the propagation path of the three-color parallel light, and light beams pass through the wavelength selector and then pass through a beam splitter group I; the light beam is divided into a transmission light beam and a reflection light beam after passing through the beam splitter group I, wherein the reflection light beam enters the optical detector group, and the transmission light beam enters the beam splitter group II. The beam expander is positioned between the beam splitter group II and the micro lens array group and is used for expanding the beam.
As shown in fig. 2, the microlens array set consists of two microlens arrays and a fourier lens, and homogenizes the light beam to reduce the coherence of the light source. After passing through the microlens array I, the light beam is divided into many small sub-beams, and the microlens array II converts the sub-beams from spherical waves into plane waves. After passing through the fourier lens, these sub-beams are superimposed on the back focal plane. Under the action of the micro lens array group, the light beam far field distribution can be flat-top light intensity distribution. The beam splitter is positioned between the spatial light modulator and the receiving screen, the beam after being split passes through the micro-lens array group and the beam splitter and then is vertically incident to the working area of the spatial light modulator, and when a hologram is loaded on the spatial light modulator, a color holographic reconstruction image with low speckle noise can be seen on the receiving screen.
As shown in fig. 3, the wavelength selector has three transparent regions corresponding to the incident regions of the three-color light beams, and the wavelength selector can control the three-color light beams to pass through the corresponding transparent regions. When one of the two color beams passes through, the other two color beams are blocked. The three-color light beams sequentially pass through the wavelength selector in time sequence, t1Time of red light passing, t2At the moment green light passes through t3The blue light passes through at the moment, and the light beam passing time of each color is the same.
The optical detector group can detect the light beam passing through the wavelength selector in real time and convert the detected signal into an electric signal to be transmitted to a computer.
The beam splitting lens group I is formed by arranging three semi-transparent semi-reflecting lenses in a diagonal adjacent mode, the beam splitting lens group II is formed by arranging three semi-transparent semi-reflecting lenses in a close contact and parallel mode, the sizes of lenses in the beam splitting lens group I and the beam splitting lens group II are completely the same, and the beam splitting lens group II is used for keeping the optical axes of three-color light beams at the same position, so that the light beams can be expanded by using the same beam expander; the size of the lens of the spectroscope is different from that of the lens group of the spectroscope, but is equal to the size of the working area of the spatial light modulator, and the spectroscope is used for enabling the light beam to vertically enter the spatial light modulator.
The parameters of the micro lens array I and the micro lens array II in the micro lens array group are the same, and the micro lens array I and the micro lens array II are both composed of odd number of sub lenses. The distance between the microlens array I and the microlens array II is equal to the focal length of the sub-lenses, and the microlens array II is positioned on the front focal plane of the Fourier lens. The light beam homogenized by the micro-lens array group is irradiated on the working area of the spatial light modulator through the spectroscope, and the spatial light modulator is positioned on the back focal plane of the Fourier lens.
Preferably, the switching frequency of the light beam of the wavelength selector is not lower than the human eye flicker frequency and not higher than the refresh frequency of the spatial light modulator, the size of the array surface of the micro-lens array group is not lower than the size of the working area on the spatial light modulator, the signals detected by the optical detector group are processed on a computer, the computer synchronously controls the holograms loaded on the spatial light modulator, and the switching frequency of the holograms is controlled to be consistent with the frequency of the three-color light beams sequentially passing through the wavelength selector.
Preferably, in order to improve the light utilization rate, the light transmittance of the half-mirror in the beam splitter group I should be kept at 70% or more; in order to eliminate chromatic aberration in the reproduced image, a chromatic aberration compensation phase is loaded on the hologram, and the generation algorithm of the hologram loaded on the spatial light modulator comprises a point source method, a surface source method, an angle spectrum method, a polygon algorithm and the like.
Description of the drawings
FIG. 1 is a front view of a color holographic display system with low speckle noise according to the present invention;
FIG. 2 is a schematic structural view of a microlens array set according to the present invention;
fig. 3 is a schematic diagram of the working principle of the wavelength selector in the present invention.
The reference numbers in the figures are as follows:
1. a red laser; 2. a green laser; 3. a blue laser; 4. a wavelength selector; 5. a beam splitter group I; 6. a beam splitter group II; 7. a beam expander; 8. a set of optical detectors; 9. a microlens array group; 10. a computer; 11. a spatial light modulator; 12. a beam splitter; 13. a receiving screen; 14. a microlens array I; 15. a microlens array II; 16. and a Fourier lens.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Fifth, detailed description of the invention
The present invention will be further described in detail with reference to the following embodiments of a color holographic display system with low speckle noise according to the present invention. It should be noted that the following examples are only for illustrative purposes and should not be construed as limiting the scope of the present invention, and that the skilled person in the art may make modifications and adaptations of the present invention without departing from the scope of the present invention.
The color holographic display system with low speckle noise utilizes three solid lasers as three primary color light sources, the wavelengths of the lasers are 671nm, 532nm and 471nm respectively, the sizes of half-transmitting and half-reflecting mirrors in a beam splitting mirror group I and a beam splitting mirror group II are 10mm × mm × mm, the size of an array surface of a micro lens array group is 13.65mm ×.65mm, each micro lens array is composed of 91 × sub lenses, the aperture of each sub lens is 0.15mm × 0.15mm, the focal length is 6.7mm, the distance between two rows is 6.7mm of the focal length of the sub lens, a micro lens array group 2 is positioned on a front focal surface of a Fourier lens, the focal length of the micro lens is 100mm, the size of the beam splitter is 15mm, the spatial light modulator adopts a reflective spatial light modulator, the refresh frequency is 60Hz, the resolution is × mm, the size of an effective working area is 12.29mm, the spatial light modulator is used for obtaining three-color holographic images by means of a holographic image which is subjected to be subjected to iterative image recording after being subjected to wavelength compensation, the three-wavelength holographic images are subjected to the three-wavelength holographic images, the three-wavelength holographic images are sequentially subjected to the three-wavelength holographic image recording, the three-wavelength holographic image is subjected to the three-wavelength holographic image after being subjected to the three-wavelength holographic image is subjected to the iterative-wavelength holographic image is subjected to the three-wavelength holographic image is subjected to the iterative-wavelength holographic image, the three-wavelength holographic image is subjected to the three-wavelength holographic image, the three-wavelength holographic image is subjected to.
Claims (5)
1. A color holographic display system with low speckle noise is characterized in that the system consists of a red laser, a green laser, a blue laser, a wavelength selector, a beam splitter group I, a beam splitter group II, a beam expander, a micro-lens array group, a beam splitter, a spatial light modulator, a computer, a light detector group and a receiving screen, wherein the red laser, the green laser and the blue laser are used for providing three-primary-color coherent light sources, and only one beam of light can pass through the wavelength selector at the same time when three beams of parallel light pass through the wavelength selector; the light beam passes through the wavelength selector and then is divided into a transmission light beam and a reflection light beam through the beam splitter group I, wherein the reflection light beam enters the optical detector group to be converted into an electric signal to be transmitted to the computer, the transmission light beam enters the beam splitter group II, and the beam expander is positioned between the beam splitter group II and the micro lens array group and is used for expanding the light beam; the micro lens array group consists of two micro lens arrays and a Fourier lens, and homogenizes light beams to reduce the coherence of a light source; the beam splitter is positioned between the spatial light modulator and the receiving screen, and the beam after being split passes through the micro-lens array group and the beam splitter and then irradiates on the working area of the spatial light modulator; the computer synchronously controls the holograms loaded on the spatial light modulator, the switching frequency of the holograms is consistent with the frequency of the three-color light beams sequentially passing through the wavelength selector, and a color holographic reproduction image with low speckle noise can be seen on the receiving screen.
2. The holographic color display system with low speckle noise of claim 1, wherein the wavelength selector controls the three color beams to pass through their respective transparent regions, when one of the color beams passes through, the other two color beams are blocked, the three color beams sequentially pass through the wavelength selector in time sequence, and the passing time of each color beam is the same; the optical detector group can detect the light beam passing through the wavelength selector in real time; the beam splitting lens group II is used for keeping the optical axes of the three-color light beams at the same position, so that the light beams can be expanded by using the same beam expander.
3. The color holographic display system with low speckle noise of claim 1, wherein the parameters of the microlens array I and the microlens array II in the microlens array set are the same; the distance between the micro lens array I and the micro lens array II is equal to the focal length of the sub lens, and the micro lens array II is positioned on the front focal plane of the Fourier lens; when the light beam passes through the micro lens array I, the light beam is divided into a plurality of small sub light beams, the micro lens array II converts the sub light beams from spherical waves into plane waves, and when the sub light beams pass through the Fourier lens, the sub light beams are superposed on a back focal plane; under the action of the micro lens array group, the light beam far field distribution can be realized to be light intensity distribution of a flat top type, the light beam homogenized by the micro lens array group is irradiated on the working area of the spatial light modulator through the spectroscope, and the spatial light modulator is positioned on the back focal plane of the Fourier lens.
4. The color holographic display system with low speckle noise of claim 1, wherein the beam switching frequency of the wavelength selector is not lower than the human eye flicker frequency and not higher than the refresh frequency of the spatial light modulator, and the size of the array surface of the microlens array set is not lower than the size of the working area on the spatial light modulator.
5. The color holographic display system with low speckle noise of claim 1, wherein, in order to improve the light utilization rate, the light transmittance of the half mirror in the beam splitter group I should be kept at 70% or above; in order to eliminate chromatic aberration in the reproduced image, a chromatic aberration compensation phase is loaded on the hologram, and the generation algorithm of the hologram loaded on the spatial light modulator comprises a point source method, a surface source method, an angle spectrum method, a polygon algorithm and the like.
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Cited By (3)
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| CN113448234A (en) * | 2021-07-19 | 2021-09-28 | 北京航空航天大学 | Holographic 3D display system based on virtual array splicing of spatial light modulator |
| CN113467210A (en) * | 2021-06-22 | 2021-10-01 | 安徽大学 | Multi-dimensional space-time optical field compression holographic encryption device and method |
| WO2022126804A1 (en) * | 2020-12-14 | 2022-06-23 | 北京航空航天大学 | Holographic true 3d display system and method based on adjustable liquid crystal grating |
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