CN111459005A - Space division multiplexing color holographic reproduction system and implementation method - Google Patents
Space division multiplexing color holographic reproduction system and implementation method Download PDFInfo
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Abstract
The invention discloses a space division multiplexing color holographic reconstruction system based on a DVI-separator, which comprises a red laser, a green laser, a blue laser, three attenuation sheets, three spatial filters, three plano-convex lenses, three beam splitting prisms, three spatial light modulators, a light combining prism, a receiving screen, a DVI-separator and a computer. The invention only uses one computer to load the three-color hologram, which can reduce the complexity of the space division multiplexing system and simplify the synchronous loading problem of the three-color component hologram; in the system, three-color reproduction diffraction images are superposed into a color reproduction image after being transmitted and reflected for even times by the beam splitter prism and the beam combiner prism, and the diffraction light path of the reproduction image does not contain optical elements such as lenses and the like, so that the problems of axial chromatic aberration and magnification chromatic aberration in color holographic reproduction do not need to be considered. In addition, the invention provides a complete implementation method of the space division multiplexing color holographic reconstruction system, and provides powerful architectural support for color holographic three-dimensional display.
Description
Technical Field
The invention belongs to the field of computer generated holography and three-dimensional display, and particularly relates to a spatial multiplexing color holographic reconstruction system based on a DVI-separator and an implementation method thereof.
Background
The holographic three-dimensional display technology is a three-dimensional display technology which is based on the wave optics principle and can completely record and reconstruct the light wave of a three-dimensional object. The continuous progress of computer technology and wave optics strongly pushes the development of the computer holographic technology, and the appearance of a display card loaded with a GPU, a spatial light modulator and other related hardware devices enables the computer holographic three-dimensional dynamic display to be possible. The color holographic display based on the spatial light modulator needs to synthesize the holographic reconstruction images of red, green and blue three-color components, and the main methods are space division multiplexing and time division multiplexing. The spatial multiplexing method is to irradiate three-color laser to three spatial light modulators respectively, and to ensure that three-color reproduction diffraction images are superposed on a spatial position through the design of a system light path. The time division multiplexing method is to irradiate three-color laser on the same spatial light modulator in a time division manner, and a color reproduction image is obtained by utilizing the persistence of vision effect of human eyes. The time division multiplexing system has higher requirements on the frame rates of the spatial light modulator and a hardware system, dynamic holography is difficult to realize, and meanwhile, due to the fact that a certain delay exists in a laser switch, the color holographic reproduction image also has the phenomena of color crosstalk and the like. The spatial multiplexing optical structure is slightly complicated, but the requirements on hardware devices such as a spatial light modulator are low, and the spatial multiplexing optical structure has high optical efficiency and reproduction quality, and is widely applied to a color holographic reproduction system.
However, the application of spatial multiplexing color holographic reconstruction systems is currently balanced by two problems, namely the problem of simultaneous loading of three-color holograms on three spatial light modulators, and the problem of accurate spatial registration of three-color reconstructed diffraction images. For the first problem, the common solution is to use three computers to connect to three spatial modulators respectively, and to implement synchronous loading of the holograms of various colors by computer programs, which requires multi-machine parallel implementation and has high system complexity. For the second problem, there are few explicitly feasible embodiments at present.
Disclosure of Invention
The invention provides a space division multiplexing color holographic reconstruction system based on a DVI-separator and provides a specific implementation method thereof, aiming at the problems of synchronous loading of three-color holograms and accurate registration of three-color re-diffraction images in space in the existing space division multiplexing color holographic reconstruction system.
The invention provides a space division multiplexing color holographic reconstruction system based on a DVI-separator, which comprises a red, green and blue three-color laser, three attenuation sheets, three spatial filters, three plano-convex lenses, three beam splitting prisms, three spatial light modulators, a light combining prism, a receiving screen, a DVI-separator and a computer, wherein the three attenuation sheets are arranged on the three spatial filters;
red, green and blue laser beams emitted by red, green and blue three-color lasers are sequentially incident to corresponding attenuation sheets, spatial filters, plano-convex lenses, beam splitting prisms and spatial light modulators, three-color reproduction diffraction images are formed after being reflected by the corresponding spatial light modulators, and the three-color reproduction diffraction images are superposed into color reproduction images on a receiving screen after being transmitted and reflected by even-numbered times of the corresponding beam splitting prisms and beam combining prisms; b, G, R three ports of the DVI-separator are respectively connected with three spatial light modulators correspondingly, the computer calculates the three-color component hologram and synthesizes the three-color component hologram into a color hologram, and the three-color component hologram is loaded on the corresponding spatial light modulator through the DVI-separator;
the light path optical lengths from the red, green and blue laser beams reflected by the corresponding spatial light modulators to the light-combining prism are equal.
Further, the three beam splitting prisms and the one light combining prism are configured to: any one color reproduction diffraction image in three color reproduction diffraction images formed after being reflected by the spatial light modulator is transmitted by the beam splitter prism and the beam combiner prism for even times and then is irradiated on the receiving screen, and the other two color reproduction diffraction images are reflected by the beam splitter prism and the beam combiner prism for even times and then are irradiated on the receiving screen.
The invention also provides a method for realizing the space division multiplexing color holographic reproduction system, which comprises the following steps:
s1: a point registration step: determining the positions and postures of the red, green and blue lasers, the attenuation sheets, the spatial filters, the plano-convex lenses, the beam splitting prisms, the spatial light modulators, the light combining prism and the receiving screen to obtain a space division multiplexing basic light path;
s2: three-color reproduction diffraction image center alignment step: determining the position posture of each spatial light modulator to ensure that the positions of the laser light of each color incident on the corresponding spatial light modulators are the same;
s3: and (3) parallel light alignment: and determining the position and the posture of a collimation beam expanding device consisting of a spatial filter and a plano-convex lens.
Further, step S1 specifically includes the following sub-steps:
s101: adjusting a one-color laser to horizontally emit laser, so that the emitted laser irradiates the central position of the spatial light modulator;
s102: the spatial light modulator is not loaded with a hologram, and the position and the posture of the spatial light modulator are adjusted to ensure that the plane of the spatial light modulator is vertical to incident laser;
s103: adding a beam splitter prism in a light path, and adjusting the beam splitter prism to enable a light beam to vertically enter the beam splitter prism;
s104: completing the construction of other two-color light paths according to the method of the steps S101-S103 to obtain a basic color holographic reproduction light path;
s105: and adding a light-combining prism into the obtained basic color holographic reconstruction light path, and continuously adjusting the light-combining prism until the propagation directions of the red light beam, the green light beam and the blue light beam are completely overlapped, wherein the light-combining prism is placed at a proper position, so that the light path optical path of the red laser light, the green laser light and the blue laser light after being reflected by the corresponding spatial light modulators is equal to that of the light-combining prism.
Further, step S2 specifically includes the following sub-steps:
s201: loading three-color holograms on three spatial light modulators;
s202: taking one of the color light paths as a reference, and adjusting the positions of the spatial light modulators of the other two color light paths to enable the central positions of the three-color light reproduction diffraction images to coincide;
s203: unloading the three-color holograms on the three spatial light modulators, checking whether the light spots of the three-color light are overlapped on the receiving screen, and returning to the step S1 to adjust the postures of the three spatial light modulators if the light spots of the three-color light are not overlapped; otherwise, the step of aligning the three-color light reproduction diffraction image center is finished.
Further, step S3 specifically includes the following sub-steps:
s301: taking the light paths of the two colors of light as reference beams, adding a spatial filter in a third light path, and adjusting the position and the posture of the spatial filter to ensure that the central point of the third color of light is still superposed with the central point of the reference beams of the two colors on a receiving screen after passing through a corresponding beam splitter prism, a spatial light modulator and a light combination prism;
s302: keeping the two reference beams unchanged, adding a plano-convex lens in a third color light path, and adjusting the position and the posture of the plano-convex lens to ensure that the size of a reflected image of the spatial light modulator is constant, and the center of the reflected image is superposed with the center points of other two-color reference beams on a receiving screen to finish the collimation and beam expansion of the third color light path;
s303: and finishing the collimation and beam expansion of other two color light paths according to the method of the steps S301 to S302.
The invention has the beneficial effects that:
1) the invention constructs a space division multiplexing color holographic reconstruction system based on a DVI-separator, can reduce the complexity of the space division multiplexing system and simplify the synchronous loading problem of three-color component holograms;
2) in the invention, three-color reproduction diffraction images are superposed into a color reproduction image after even-numbered transmission/reflection by the beam splitter prism and the beam combiner prism, and the diffraction light path of the reproduction diffraction image does not contain optical elements such as a lens and the like, so that the system provided by the invention does not need to consider the problems of axial chromatic aberration and magnification chromatic aberration in color holographic reproduction;
3) the invention provides a complete construction process of the space division multiplexing color holographic reconstruction system, can realize the accurate registration of three-color reconstruction diffraction images, and provides architectural support for color holographic three-dimensional display.
Drawings
FIG. 1 is a schematic diagram of a DVI-splitter based spatial multiplexing color holographic reconstruction system of the present invention;
FIG. 2 is an effect diagram of the reconstructed diffraction image of the present invention under different placement modes of the beam splitter prism, wherein a) is an even transmission effect diagram, b) is an odd transmission and odd reflection effect diagram, and c) is an even reflection effect diagram;
fig. 3 is an explanatory diagram of input and output signals of the DVI-splitter of the present invention;
FIG. 4 is a flow chart of the spatial multiplexing color holographic reconstruction method based on DVI-splitter of the present invention;
FIG. 5 is a schematic diagram of the present invention for verifying whether the laser is vertically incident on the beam splitter prism, wherein a) is a schematic diagram of the laser vertical incidence, and b) is a schematic diagram of the laser oblique incidence;
FIG. 6 is a diagram showing the effect of point registration in the construction of a DVI-splitter-based spatial multiplexing color holographic reconstruction system of the present invention;
FIG. 7 is a comparison graph before and after the center of the reconstructed diffraction image is aligned in the construction of the spatial multiplexing color holographic reconstruction system based on DVI-separator of the present invention, wherein a) is before the center of the reconstructed image is calibrated, b) is after the center of the existing image is calibrated;
fig. 8 is a color hologram reproduction effect diagram of the DVI-splitter based spatial multiplexing color hologram reproduction system of the present invention, in which a) is an original image, b) is a color hologram, and c) is a color hologram reproduction image.
In the drawings:
1-blue laser (B L aser), 2-green laser (G L aser), 3-red laser (R L aser), 4-first attenuator, 5-first spatial filter, 6-first plano-convex lens, 7-first beam splitter prism (BS), 8-first spatial light modulator (S L M), 9-second attenuator, 10-second spatial filter, 11-second plano-convex lens, 12-second beam splitter prism (BS), 13-second spatial light modulator (S L M), 14-third attenuator, 15-third spatial filter, 16-third plano-convex lens, 17-third beam splitter prism (BS), 18-third spatial light modulator (S L M), 19-beam combiner prism (X-Cube), 20-receiving screen, 21-DVI-splitter, 22-computer, 23-wire.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, the DVI-splitter-based spatial multiplexing color holographic reconstruction system of the present invention includes a blue laser 1, a green laser 2, a red laser 3, a first attenuation sheet 4, a first spatial filter 5, a first plano-convex lens 6, a first beam splitter prism 7, a first spatial light modulator 8, a second attenuation sheet 9, a second spatial filter 10, a second plano-convex lens 11, a second beam splitter prism 12, a second spatial light modulator 13, a third attenuation sheet 14, a third spatial filter 15, a third plano-convex lens 16, a third beam splitter prism 17, a third spatial light modulator 18, a light combining prism 19, a receiving screen 20, a DVI-splitter 21, a computer 22, and a wire 23. Specifically, B, G, R three ports of the DVI-separator are respectively connected to three spatial light modulators, the computer calculates three-color-component holograms and synthesizes them into color holograms, and the color-component holograms are loaded onto the corresponding spatial light modulators through the DVI-separator;
blue laser emitted by the blue laser 1 sequentially enters the first attenuation sheet 4, the first spatial filter 5, the first plano-convex lens 6, the first beam splitter prism 7 and the first spatial light modulator 8, a blue reproduction diffraction image is formed after being reflected by the first spatial light modulator 8, and the blue reproduction diffraction image is reflected for the first time by the first beam splitter prism 7 and reflected for the second time by the beam combiner 19 and then is emitted to the receiving screen 20.
The green laser emitted by the green laser 2 is sequentially incident to the second attenuation sheet 9, the second spatial filter 10, the second plano-convex lens 11, the second beam splitter prism 12 and the second spatial light modulator 13, and is reflected by the second spatial light modulator 13 to form a green reproduction diffraction image, and the green reproduction diffraction image is transmitted for the first time by the second beam splitter prism 12 and transmitted for the second time by the beam combiner prism 19 and then is incident on the receiving screen 20.
The red laser emitted by the red laser 3 is reflected by the third spatial light modulator 18 through the third attenuator 14, the third spatial filter 15, the third convex lens 16, the third beam splitter prism 17 and the third spatial light modulator 18 to form a red reproduced diffraction image, and the red reproduced diffraction image is reflected for the first time by the third beam splitter prism 17 and reflected for the second time by the beam combiner prism 19 to be incident on the receiving screen 20. The resulting three-color reconstructed diffraction images are superimposed on the receiving screen as a color reconstructed image.
Since the spatial multiplexing color hologram display reproduction system needs to synthesize three-color-component hologram reproduction images of red, green, and blue, elements such as a beam splitter prism and a beam combiner prism need to be used in an optical path. The spatial arrangement of the beam splitting prism and the beam combining prism will affect the reconstruction effect of the holographic reconstruction image, as shown in fig. 2. When the hologram reconstruction diffraction image is transmitted by the beam splitter prism and the beam combiner prism for even number of times, the hologram reconstruction diffraction image can be obtained on the receiving screen, as shown in fig. 2 a); when the holographically reproduced diffraction image is transmitted for odd times and reflected for odd times by the beam splitter prism and the beam combiner prism, a mirror symmetry image of the holographically reproduced diffraction image can be obtained on the receiving screen, as shown in fig. 2 b); after the hologram reconstruction diffraction image is reflected by the beam splitter prism and the beam combiner prism for even number of times, the hologram reconstruction diffraction image can be obtained on the receiving screen, as shown in fig. 2 c). Because the directions of the light paths of the colors in the space division multiplexing color holographic reproduction system are different, the spatial distribution of the beam splitting prism and the beam combining prism of each light path is also different. In order to accurately reproduce the holographic reproduction image and ensure that the three-color reproduction images are superposed in space, in the example, the green channel adopts the arrangement mode of figure 2a), and the red channel and the blue channel adopt the arrangement mode of figure 2c), and the three-color diffraction images are superposed into the color reproduction image on the receiving screen after being transmitted/reflected for even times. In this embodiment, the output powers of the rgb three-color laser devices of the spatial multiplexing color holographic reconstruction system based on the DVI-splitter are all 50mW, and the wavelengths of the rgb three-color light are λR＝671nm，λG＝532nm，λB473nm, three spatial filters respectively containing a microscope objective of 40 times, three beam splitting prisms of 25.4mm × 25.4mm × 25.4.4 mm in size, 50% of refractive index and 50% of transmittance, three spatial light modulators of 8 μm in pixel size, 1920 × 1080 in resolution and 15.36mm × 8.64.64 mm in effective size, a light combining prism of 27mm × 27mm × 23mm in size and green light transmittance>91% red light reflectance of>98% of blue light reflectance of>94 percent; the input signal of the DVI-splitter is a color hologram, and three ports output R, G, B component holograms respectively and are loaded on three spatial light modulators accordingly, as shown in fig. 3. Red, green and blueThree-color lasers respectively irradiate the three spatial light modulators, and three-color reproduction diffraction images are superposed into a color reproduction image after even-numbered transmission/reflection through the beam splitter prism and the beam combiner prism.
The implementation method of the spatial multiplexing color holographic reconstruction system based on the DVI-splitter according to this embodiment can implement accurate registration of three-color reconstructed diffraction images of red, blue and green in space, as shown in fig. 4, and specifically includes the following steps:
s1: a point registration step: determining the positions and postures of main elements such as a laser, an attenuation sheet, a spatial filter, a plano-convex lens, a beam splitter prism, a spatial light modulator, a light combination prism, a receiving screen and the like, and obtaining a space division multiplexing basic optical path. The method specifically comprises the following substeps:
s101: adjusting the blue laser 1 to horizontally emit blue laser light, and irradiating the blue laser light on the center position of the first spatial light modulator 8;
s102: the first spatial light modulator 8 is not loaded with a hologram, the position and the posture of the first spatial light modulator 8 are adjusted, so that the plane of the first spatial light modulator 8 is vertical to the incident blue laser, and the experimental phenomenon is that a light spot reflected by the first spatial light modulator 8 is superposed with an emergent blue laser spot;
s103: a first light splitting prism 7 is added in a light path, the first light splitting prism 7 is adjusted to enable light emitted by the blue laser 1 to be vertically incident to the first light splitting prism 7, experimental phenomena are that the front position and the rear position of each element are defined by the light propagation direction before and after the first light splitting prism 7 is added, the blue laser light spot position on a receiving screen 20 behind the first light splitting prism 7 is not changed, the principle is that when light vertically passes through an optical element, the propagation direction of the light cannot be changed, and when the light is obliquely incident, the transmitted light beam and an original light beam are not overlapped, as shown in fig. 5;
s104: completing the construction of red and green light paths according to the method of the steps S101-S103 to obtain a basic color holographic reproduction light path;
s105: and adding a light combination prism 19 into the light path, and continuously adjusting the light combination prism 19 until the propagation directions of the red light, the green light and the blue light are completely overlapped. The light combining prism is placed at a proper position, so that the optical paths of the blue, green and red light paths which are respectively reflected by the first, second and third spatial light modulators and then reach the light combining prism 19 are equal. After point registration, the light spots of the three-color laser light are overlapped together through the respective beam splitter prism and the beam combiner 19, and the three-color laser light spots are visually represented as white light spots, as shown in fig. 6.
S2: three-color reproduction diffraction image center alignment step: determining the position and attitude of each spatial light modulator
In the point registration step, the light spots of the laser light of each color are irradiated at the central positions of the respective spatial light modulators, and the position deviation of the three-color laser light on the respective spatial light modulators can cause the original points of the three-color reproduction diffraction images to be misaligned, so that the positions of the spatial light modulators need to be adjusted to enable the centers of the three-color reproduction diffraction images to be aligned, that is, the spatial light modulators are adjusted to enable the positions of the laser light of each color incident on the respective spatial light modulators to be the same. The method specifically comprises the following substeps:
s201: three-color holograms are loaded on the three spatial light modulators, and in order to facilitate subsequent registration, a calculation hologram of a two-dimensional XOY coordinate system is generated in the embodiment of the invention;
s202: taking one of the color light paths as a reference, adjusting the positions of the other two paths of spatial light modulators to ensure that the central positions of the three-color light reproduction diffraction images are superposed;
s203: unloading the three-color holograms on the three spatial light modulators, checking whether the three-color light spots coincide on the receiving screen 20, and if not, returning to the step S1 to adjust the postures of the three spatial light modulators; otherwise, the step of aligning the center of the reproduced diffraction image is ended.
Since the position of the spatial light modulator may be changed while adjusting its posture, the hologram on the spatial light modulator should be unloaded after the completion of step S202 to check whether the three color light spots on the receiving screen 20 coincide. If the three color light spots do not coincide, it means that the posture of the spatial light modulator is changed, and it is necessary to return to step S1 to readjust the posture of the spatial light modulator until the three color light spots coincide on the receiving screen 20, and then to perform the step S2 of center alignment of the reproduced diffraction image. Fig. 7 shows a comparison of the reconstructed diffraction image before and after the origin of coordinates is aligned, fig. 7a) shows the distribution of three color reconstructed diffraction images on the receiving screen 20 before the alignment, the three colors not being completely coincident; fig. 7b) shows the distribution of the collimated three-color reconstructed diffraction image on the receiving screen 20, with the three color centers coinciding.
S3, parallel light alignment: determining the position and attitude of a collimating beam-expanding device consisting of a spatial filter and a plano-convex lens
After the point registration and the center alignment of the reproduced diffraction image are completed, the positions and attitudes of the respective lasers, beam splitting prism, beam combining prism, spatial light modulator have been determined. In order to obtain parallel light, a collimation and beam expansion device is added in each of the three color light paths. Since the collimating and beam expanding device includes a lens element, the position of the lens element will affect the propagation direction of light, and therefore, the collimating and beam expanding portion also needs to be aligned. The invention combines a spatial filter and a plano-convex lens to collimate and expand light beams, and the specific calibration steps are as follows:
s301: the light paths of red and green light are used as reference light beams, a first spatial filter 5 is added in a blue light path, and the position and the posture of the first spatial filter 5 are adjusted, so that the central point of the blue light is still superposed with the central points of the red and green light reference light beams on a receiving screen 20 after passing through a first beam splitter prism 7, a first spatial light modulator 8 and a light combination prism 19;
s302: still regard red and green two light paths as the reference beam, add the first plano-convex lens 6 in the blue light path, adjust the position and posture of the first plano-convex lens 6, make the reflected image size of the first spatial light modulator 5 invariable, and the reflected image center coincides with two other bunches of light central points on receiving the screen 20, finish the quasi-expanded beam of the light path of blue light;
s303: and finishing the collimation and the beam expansion of the red and green light paths according to the methods of the steps S301 to S302.
The construction of the space division multiplexing color hologram reconstruction system of the present invention can be completed based on the above three steps S1-S3. Advantageously, the diffractive optical path of the reproduced diffraction image of the space division multiplexing color reproduction system designed by the invention does not contain optical elements of a lens, so that the system does not need to carry out the processing of axial chromatic aberration and chromatic aberration of magnification when synthesizing the color image. Fig. 8 shows the color reproduction effect of the spatial multiplexing color holographic reproduction system proposed by the present invention, fig. 8a) is an original color image, and four letters of "BUAA" are red, white, green, and blue, respectively; figure 8b) is a color hologram input by a computer to a DVI-separator; fig. 8c) is a color holographic reconstruction of the original image. Therefore, the three-color reproduced diffraction images can realize accurate registration, and axial chromatic aberration and magnification chromatic aberration do not exist between the three-color reproduced diffraction images.
In summary, the invention provides a spatial multiplexing color holographic reconstruction system based on DVI-separator and a realization method thereof, the system only uses a computer to load three-color holograms, thus reducing the complexity of the spatial multiplexing system and simplifying the synchronous loading problem of three-color component holograms; in the system, three-color reproduction diffraction images are superposed into a color reproduction diffraction image after even-numbered transmission/reflection by a beam splitter prism and a beam combiner prism, and the diffraction light path of the reproduction diffraction image does not contain optical elements such as a lens and the like, so that the problems of axial chromatic aberration and magnification chromatic aberration in color holographic reproduction do not need to be considered; in addition, the invention provides a complete construction process of the space division multiplexing color holographic reconstruction system, can realize the accurate registration of three-color reconstruction diffraction images, and provides powerful structural support for color holographic three-dimensional display.
It will be apparent to those skilled in the art that various modifications and improvements can be made to the embodiments of the present invention without departing from the inventive concept thereof, and these modifications and improvements are intended to be within the scope of the invention.
Claims (6)
1. A space division multiplexing color holographic reproduction system based on DVI-separator is characterized by comprising three color lasers of red, green and blue, three attenuation sheets, three spatial filters, three plano-convex lenses, three beam splitting prisms, three spatial light modulators, a light combining prism, a receiving screen, a DVI-separator and a computer;
red, green and blue laser beams emitted by red, green and blue three-color lasers are sequentially incident to corresponding attenuation sheets, spatial filters, plano-convex lenses, beam splitting prisms and spatial light modulators, three-color reproduction diffraction images are formed after being reflected by the corresponding spatial light modulators, and the three-color reproduction diffraction images are superposed into color reproduction images on a receiving screen after being transmitted and reflected by even-numbered times of the corresponding beam splitting prisms and beam combining prisms; b, G, R three ports of the DVI-separator are respectively connected with three spatial light modulators correspondingly, the computer calculates the three-color component hologram and synthesizes the three-color component hologram into a color hologram, and the three-color component hologram is loaded on the corresponding spatial light modulator through the DVI-separator;
the light path optical lengths from the red, green and blue laser beams reflected by the corresponding spatial light modulators to the light-combining prism are equal.
2. The spatial multiplexing color holographic reconstruction system of claim 1, wherein three beam splitting prisms and one beam combining prism are configured to: any one color reproduction diffraction image in three color reproduction diffraction images formed after being reflected by the spatial light modulator is transmitted by the beam splitter prism and the beam combiner prism for even times and then is irradiated on the receiving screen, and the other two color reproduction diffraction images are reflected by the beam splitter prism and the beam combiner prism for even times and then are irradiated on the receiving screen.
3. A method for implementing the spatial multiplexing color holographic reconstruction system according to claim 1 or 2, comprising the steps of:
s1: a point registration step: determining the positions and postures of the red, green and blue lasers, the attenuation sheets, the spatial filters, the plano-convex lenses, the beam splitting prisms, the spatial light modulators, the light combining prism and the receiving screen to obtain a space division multiplexing basic light path;
s2: three-color reproduction diffraction image center alignment step: determining the position posture of each spatial light modulator to ensure that the positions of the laser light of each color incident on the corresponding spatial light modulators are the same;
s3: and (3) parallel light alignment: and determining the position and the posture of a collimation beam expanding device consisting of a spatial filter and a plano-convex lens.
4. The implementation method of claim 3, wherein the step S1 specifically includes the following sub-steps:
s101: adjusting a one-color laser to horizontally emit laser, so that the emitted laser irradiates the central position of the spatial light modulator;
s102: the spatial light modulator is not loaded with a hologram, and the position and the posture of the spatial light modulator are adjusted to ensure that the plane of the spatial light modulator is vertical to incident laser;
s103: adding a beam splitter prism in a light path, and adjusting the beam splitter prism to enable a light beam to vertically enter the beam splitter prism;
s104: completing the construction of other two-color light paths according to the method of the steps S101-S103 to obtain a basic color holographic reproduction light path;
s105: and adding a light-combining prism into the obtained basic color holographic reconstruction light path, and continuously adjusting the light-combining prism until the propagation directions of the red light beam, the green light beam and the blue light beam are completely overlapped, wherein the light-combining prism is placed at a proper position, so that the light path optical path of the red laser light, the green laser light and the blue laser light after being reflected by the corresponding spatial light modulators is equal to that of the light-combining prism.
5. The implementation method of claim 3, wherein the step S2 specifically includes the following sub-steps:
s201: loading three-color holograms on three spatial light modulators;
s202: taking one of the color light paths as a reference, and adjusting the positions of the spatial light modulators of the other two color light paths to enable the central positions of the three-color light reproduction diffraction images to coincide;
s203: unloading the three-color holograms on the three spatial light modulators, checking whether the light spots of the three-color light are overlapped on the receiving screen, and returning to the step S1 to adjust the postures of the three spatial light modulators if the light spots of the three-color light are not overlapped; otherwise, the step of aligning the three-color light reproduction diffraction image center is finished.
6. The implementation method of claim 3, wherein the step S3 specifically includes the following sub-steps:
s301: taking the light paths of the two colors of light as reference beams, adding a spatial filter in a third light path, and adjusting the position and the posture of the spatial filter to ensure that the central point of the third color of light is still superposed with the central point of the reference beams of the two colors on a receiving screen after passing through a corresponding beam splitter prism, a spatial light modulator and a light combination prism;
s302: keeping the two reference beams unchanged, adding a plano-convex lens in a third color light path, and adjusting the position and the posture of the plano-convex lens to ensure that the size of a reflected image of the spatial light modulator is constant, and the center of the reflected image is superposed with the center points of other two-color reference beams on a receiving screen to finish the collimation and beam expansion of the third color light path;
s303: and finishing the collimation and beam expansion of other two color light paths according to the method of the steps S301 to S302.
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