CN111352328A - Holographic display material, holographic display system and holographic display method thereof - Google Patents
Holographic display material, holographic display system and holographic display method thereof Download PDFInfo
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Images
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- G—PHYSICS
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- 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
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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
- G03H1/2202—Reconstruction geometries or arrangements
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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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- G—PHYSICS
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- 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
- G03H2001/026—Recording materials or recording processes
Abstract
The invention discloses a holographic display material, a holographic display system and a holographic display method thereof, wherein the holographic display material comprises: the light-sensitive optical fiber comprises a mixture consisting of polymer powder, a monomer and a photosensitizer, and gold nanorods dispersed in the mixture; the length-diameter ratio of the gold nanorods meets the requirement of forming a grating structure under the irradiation of light waves with set wavelength or wavelengths. The doped gold nanorods enable the holographic display material obtained after doping to have higher diffraction efficiency. The gold nanorods have more degrees of freedom, and the polymer nanocomposite can be optimized by utilizing the shape dependence of the gold nanorods. Because the gold nanorods have two space dimensions of length and width, the surface plasmon resonance of the gold nanorods has two modes, namely longitudinal surface plasmon resonance and transverse surface plasmon resonance. The dual resonance has the advantages of enhanced absorption, optical gain, amplified spontaneous emission, prominent angular selectivity, and the like.
Description
Technical Field
The invention relates to the technical field of holographic display, in particular to a holographic display material, a holographic display system and a holographic display method thereof.
Background
The holographic display is to record specific light wave from object in interference fringe mode by means of interference principle, and to store all the information of object light wave front in the recording medium. When the holographic display material for recording the hologram is irradiated with light waves, the original light waves can be reproduced due to the diffraction principle, thereby forming a realistic three-dimensional image of the original object. The holographic display can see all the features of the object and has parallax effect. The holographic display technology has extremely wide application prospect in the fields of data storage, nondestructive testing, three-dimensional display and the like.
Currently commonly used holographic display materials include silver halide emulsions and dichromated gelatin, among others. However, the dynamic range of these materials is low, and it is difficult to achieve sufficiently high diffraction efficiency.
Disclosure of Invention
The invention provides a holographic display material, a holographic display system and a holographic display method thereof, which are used for improving diffraction efficiency.
In a first aspect, the present invention provides a holographic display material comprising: the light-sensitive optical fiber comprises a mixture consisting of polymer powder, a monomer and a photosensitizer, and gold nanorods dispersed in the mixture;
the length-diameter ratio of the gold nanorods meets the condition of forming a grating structure under the irradiation of light waves with set one or more wavelengths.
In a possible implementation manner, in the above holographic display material provided by the present invention, the gold nanorods at least include: a first gold nanorod, a second gold nanorod and a third gold nanorod;
the length-diameter ratio of the first gold nanorod meets the condition of forming a grating structure under the irradiation of red light;
the length-diameter ratio of the second gold nanorod meets the condition of forming a grating structure under the irradiation of green light;
the length-diameter ratio of the third gold nanorod meets the condition of forming a grating structure under the irradiation of blue light.
In a possible implementation manner, in the holographic display material provided by the present invention, the length-diameter ratio of the first gold nanorod is 1.1, and the first gold nanorod forms a grating structure under the irradiation of a light wave with a wavelength of 630 nm;
the length-diameter ratio of the second gold nanorod is 3.4, and the second gold nanorod forms a grating structure under the irradiation of light waves with the wavelength of 530 nm;
the length-diameter ratio of the third gold nanorod is 6.3, and the third gold nanorod forms a grating structure under the irradiation of light waves with the wavelength of 460 nm.
In a possible implementation manner, in the holographic display material provided by the invention, the monomer is methyl methacrylate or acrylamide.
In a second aspect, the present invention provides a holographic display system comprising: the holographic film comprises a first light source device, a first optical modulation component and a holographic film, wherein the first optical modulation component is positioned on the light-emitting side of the first light source device;
the first optical modulation component is used for splitting the received emergent light of the first light source device into two beams of coherent light to be emitted to the holographic plate;
the holographic plate adopts any holographic display material.
In one possible implementation manner, in the above-mentioned holographic display system provided by the present invention, the first optical modulation component includes: the system comprises a polarization beam splitter, an electronic switch, a spatial light modulator, a phase retarder positioned on the light-emitting side of the spatial light modulator and a reflector positioned on the reflection light path of the polarization beam splitter, wherein the electronic switch and the spatial light modulator are sequentially arranged on the transmission light path of the polarization beam splitter;
the polarization beam splitter is used for splitting incident light into transmission light with a first polarization direction and reflection light with a second polarization direction; the first polarization direction and the second polarization direction are perpendicular to each other;
the electronic switch is used for controlling the on-off of the light path;
the spatial light modulator is used for modulating incident light and then emitting the modulated incident light to the phase retarder;
the phase delayer is used for delaying the phase of incident light by odd times of pi and emitting the incident light to the holographic plate;
the reflector is used for reflecting incident light to the full display piece.
In a possible implementation manner, in the holographic display system provided by the present invention, the optical modulation component located at the light exit side of the first light source device is a first optical modulation component;
the hologram sheet includes: a first hologram, a second hologram, and a third hologram; the length-diameter ratios of the gold nanorods in the first holographic plate, the second holographic plate and the third holographic plate are different;
the holographic display system further comprises: the second light source device, the second optical modulation component, the third light source device, the third optical modulation component, the first reflector, the first half-transmitting and half-reflecting mirror and the beam splitting prism;
the wavelengths of the emergent light of the first light source device, the second light source device and the third light source device are different;
the third optical modulation component is positioned at the light emergent side of the third light source device, and the third holographic plate is positioned at the light emergent side of the third optical modulation component; the first reflector is positioned on the transmission light path of the third holographic plate and used for reflecting the transmission light of the third holographic plate to the first half mirror;
the second optical modulation component is positioned at the light-emitting side of the second light source device, and the second holographic plate is positioned at the light-emitting side of the second optical modulation component; the first half mirror is positioned on the transmission light path of the second holographic plate and used for transmitting the reflection light of the first reflector to the beam splitter prism and reflecting the transmission light of the second holographic plate to the beam splitter prism;
the beam splitting prism is located on a transmission light path of the first holographic plate and used for reflecting emergent light of the first half-transmitting half-reflecting mirror to a set position and transmitting transmission light of the first holographic plate to the set position.
In a possible implementation manner, in the above-mentioned holographic display system provided by the present invention, the holographic display system further includes: the second light source device is arranged on the second reflector;
the wavelengths of the emergent light of the first light source device, the fourth light source device and the fifth light source device are different;
the first light source device, the fourth light source device and the fifth light source device are arranged in a row, the light emitting directions are the same, and the fourth light source device is positioned between the first light source device and the fifth light source device;
the second reflector is positioned on the light-emitting side of the fifth light source device and used for reflecting the emergent light of the fifth light source device to the second half mirror;
the second half mirror is positioned on the light-emitting side of the fourth light source device and used for transmitting the reflected light of the second mirror to the polarization beam splitter and reflecting the emitted light of the fourth light source device to the polarization beam splitter;
the reflector is provided with a rotating shaft, emergent light of the first light source device, the fourth light source device and the fifth light source device is incident to the polarization light splitter in a time-sharing mode, and the rotating angles of the reflector under different time sequences are different.
In a possible implementation manner, in the holographic display system provided by the present invention, each light source device is a laser light source device;
the holographic display system further comprises: a color filter wheel positioned between the electronic switch and the spatial light modulator.
In one possible implementation manner, in the above-mentioned holographic display system provided by the present invention, each light source device includes: the light source, the spatial filter and the collimating lens group are arranged in sequence along the light emergent direction of the light source.
In one possible implementation manner, in the above-mentioned holographic display system provided by the present invention, the spatial filter includes: a converging lens group and a pinhole at the light-emitting side of the taking lens group.
In one possible implementation manner, in the above-mentioned holographic display system provided by the present invention, the polarization beam splitter includes: two tetrahedrons oppositely arranged along the bottom surfaces, a plurality of polarizing plates stacked on the bottom surface of one of the tetrahedrons, and an adhesive layer between the bottom surfaces of the two tetrahedrons for bonding the two tetrahedrons.
In a third aspect, the present invention provides a holographic display method based on any one of the above holographic display systems, including:
in the holographic optical field information writing stage, controlling a first light source device to emit emergent light with first power, controlling a first optical modulation component to decompose the emergent light of the first light source device into a first light beam and a second light beam to emit to a holographic sheet, and writing holographic optical field information in the holographic sheet;
in the holographic light field information reconstruction stage, the first light source device is controlled to emit emergent light with second power output, and the first optical modulation component is controlled to convert the emergent light of the first light source device into a second light beam to emit to the holographic sheet so as to realize holographic display;
wherein the first light beam is coherent with the second light beam, the first power being greater than the second power.
In a possible implementation manner, in the above-mentioned holographic display method provided by the present invention, the first optical modulation component includes: the system comprises a polarization beam splitter, an electronic switch, a spatial light modulator, a phase retarder positioned on the light-emitting side of the spatial light modulator and a reflector positioned on the reflection light path of the polarization beam splitter, wherein the electronic switch and the spatial light modulator are sequentially arranged on the transmission light path of the polarization beam splitter;
the controlling the first optical modulation component to split the emergent light of the first light source device into a first light beam and a second light beam to be emergent to the holographic plate comprises the following steps:
the electronic switch is turned on, emergent light of the first light source device is controlled to pass through the spatial light modulator and the phase retarder after being transmitted by the polarization beam splitter to form a first light beam, and the emergent light of the first light source device is reflected by the polarization beam splitter and then passes through the reflector to form a second light beam to be emitted to the holographic plate;
the control the first optical modulation component converts the emergent light of the first light source device into the second light beam to be emergent to the holographic plate, and the control method comprises the following steps:
and closing the electronic switch, controlling emergent light of the first light source device to pass through the polarizing beam splitter to be reflected and then pass through the reflector to form a second light beam, and emitting the second light beam to the holographic plate.
In a possible implementation manner, in the above-mentioned holographic display method provided by the present invention, further comprising:
in the holographic light field information erasing stage, the first light source device is controlled to emit emergent light with third power, the electronic switch is closed, and the emergent light of the first light source device is controlled to emit to the holographic plate after being reflected by the polarization beam splitter and the reflector;
the third power is greater than the first power.
The invention has the following beneficial effects:
the invention provides a holographic display material, a holographic display system and a holographic display method thereof, wherein the holographic display material comprises: the light-sensitive optical fiber comprises a mixture consisting of polymer powder, a monomer and a photosensitizer, and gold nanorods dispersed in the mixture; the length-diameter ratio of the gold nanorods meets the condition of forming a grating structure under the irradiation of light waves with set wavelength or wavelengths. The doped gold nanorods enable the holographic display material obtained after doping to have higher diffraction efficiency. The gold nanorods have more degrees of freedom, and the polymer nanocomposite can be optimized by utilizing the shape dependence of the gold nanorods. Because the gold nanorods have two space dimensions of length and width, the surface plasmon resonance of the gold nanorods has two modes, namely longitudinal surface plasmon resonance and transverse surface plasmon resonance. The dual resonance has the advantages of enhanced absorption, optical gain, amplified spontaneous emission, prominent angular selectivity, and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a holographic display material provided by an embodiment of the present invention;
FIG. 2 is an absorption spectrum of gold nanorods with different aspect ratios provided by an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a holographic display system according to an embodiment of the present invention;
FIG. 4 is a second schematic structural diagram of a holographic display system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a polarization beam splitter according to an embodiment of the present invention;
FIG. 6 is a third schematic structural diagram of a holographic display system according to an embodiment of the present invention;
FIGS. 7 a-7 c are schematic diagrams of the selection of angles for holographic display materials provided by embodiments of the present invention;
FIG. 8 is a fourth schematic structural diagram of a holographic display system according to an embodiment of the present invention;
FIG. 9 is a fifth schematic view of a holographic display system according to an embodiment of the present invention;
FIG. 10 is a sixth schematic view of a holographic display system according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a spatial filter according to an embodiment of the present invention;
FIG. 12 is a flow chart of a holographic display method provided by an embodiment of the present invention;
fig. 13 is a schematic diagram illustrating the division of the hologram according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The holographic display material, the holographic display system and the holographic display method provided by the embodiments of the invention are described in detail below with reference to the accompanying drawings.
In a first aspect of the embodiments of the present invention, there is provided a holographic display material, as shown in fig. 1, the holographic display material provided in the embodiments of the present invention includes: a mixture composed of a photosensitizer 101, a polymer binder 103, and a monomer 104, and gold nanorods 102 dispersed in the mixture;
the length-diameter ratio of the gold nanorods 102 satisfies the condition of forming a grating structure under the irradiation of light waves with one or more set wavelengths.
Compared with silver halide emulsion, dichromated gelatin and other holographic materials, the photopolymer has the characteristics of wide application, strong usability, low cost, strong self-programming capability and the like. To further improve the properties of the photopolymer, the photopolymer may be doped with particles. After the metal nanoparticles are doped in the photopolymer, the metal nanoparticles can diffuse in the photopolymer, and finally form a stable periodic spatial distribution in the photopolymer. Because the metal nano particles can show a strong local surface plasma resonance effect in a visible light wave band, the stable periodic distribution structure can be regarded as a strong absorption grating in a certain wavelength range, so that the doped photopolymer has strong diffraction efficiency.
In the embodiment of the invention, the photosensitizer 101, the high-molecular binder 103 and the monomer 104 form a photopolymer, and the gold nanorods are doped in the mixture, so that the holographic display material obtained after doping has higher diffraction efficiency. Compared with the doped gold nanospheres, the gold nanorods have more degrees of freedom, and the polymer nanocomposite can be optimized by utilizing the shape dependence of the gold nanorods. Because the gold nanorods have two space dimensions of length and width, the surface plasmon resonance of the gold nanorods has two modes, namely longitudinal surface plasmon resonance and transverse surface plasmon resonance. The dual resonance has the advantages of enhanced absorption, optical gain, amplified spontaneous emission, prominent angular selectivity, and the like. The absorption maximum at shorter wavelengths corresponds to the transverse mode, while the absorption maximum at longer wavelengths corresponds to the longitudinal mode.
In the specific implementation, the holographic display material doped with the gold nanorods has the function of recording holographic optical field information. Wherein, the macromolecular adhesive 103 is used as a substrate; the photosensitizer 101 can absorb photons and initiate polymerization reaction, consuming dozens of monomers; the gold nanorods 102 can generate a local surface plasmon resonance effect, and change local refractive index parameters. When the monomer 104 is irradiated by laser with a certain wavelength and intensity, the monomer 104 is consumed by polymerization; when laser light of another wavelength and intensity is used for irradiation, the formed polymer chemical bond is broken, and the monomer 104 reacts and reappears.
In embodiments of the invention, under certain conditions of non-uniform illumination, monomer 104 will diffuse from dark regions to bright regions driven by a concentration gradient. Since the monomers are consumed and the gold nanorods 102 are not consumed, the chemical potential of the bright region increases, causing the gold nanorods 102 to undergo back diffusion from light to dark. Thus, the light field information is written into the holographic display material in a manner similar to the way in which a grating is made. When the other condition of uniform illumination is adopted, the monomer 104 can reappear, the chemical potential of the original dark area is increased, the gold nanorods 102 finally uniformly diffuse into the whole material again, and the light field information is erased. The above-described processes of writing and erasing of light field information can thus be repeated to achieve the display of different holographic images.
Doped gold nanorods in embodiments of the invention include parameters in three dimensions, length, width and height, denoted as A, B and C, respectively. The section of the gold nanorod is circular, so that the parameters of the width and the height are equal and are simultaneously smaller than the length, namely A is larger than B and C. When the ratio of the length to the diameter (length-diameter ratio) R is different from the value of A/B, the sensitive wavelength of the holographic display material is different. The aspect ratio is related to the sensitive wavelength as shown in fig. 2, and for example, when the aspect ratio R is 3.4, the most preferable recording effect can be obtained only by irradiating the material with a laser beam having a wavelength of 531.6 nm. If gold nanorods with the aspect ratio R of 1.0 are doped, the sensitive wavelength of the gold nanorods is probably in the region of about 570 nm. That is, only when the light wave with the wavelength of about 570nm irradiates the material doped with the gold nanorods, a relatively obvious grating structure can be formed in the material. The material is irradiated with light waves of 530nm, and the material hardly absorbs the energy of the light waves to form a grating structure.
In view of the above, for practical full-color holographic display, if three gold nanorods with different aspect ratios are found and part of sensitive bands thereof are respectively located in the red light, green light and blue light ranges, the holographic display material can simultaneously record the gratings irradiated by the red, green and blue light waves, thereby realizing the recording of color information.
Specifically, in the holographic display material provided in the embodiment of the present invention, the gold nanorods may at least include: a first gold nanorod, a second gold nanorod, and a third gold nanorod.
The length-diameter ratio of the first gold nanorod meets the condition of forming a grating structure under the irradiation of red light; the length-diameter ratio of the second gold nanorod meets the condition of forming a grating structure under the irradiation of green light; the length-diameter ratio of the third gold nanorod meets the condition of forming a grating structure under the irradiation of blue light.
For example, the sensitive wavelengths of the first gold nanorod, the second gold nanorod and the third gold nanorod correspond to light waves near 630nm, 530nm and 460nm, respectively, so that the material can simultaneously record gratings obtained by irradiation of three light waves, namely red light, green light and blue light, and thus, color information can be recorded. In order to implement such a function, in a specific implementation, in the holographic display material provided in an embodiment of the present invention, the gold nanorods at least include: a first gold nanorod, a second gold nanorod and a third gold nanorod;
the length-diameter ratio of the first gold nanorod can be 1.1, and the first gold nanorod forms a grating structure under the irradiation of light waves with the wavelength of 630 nm; the length-diameter ratio of the second gold nanorod can be 3.4, and the second gold nanorod forms a grating structure under the irradiation of light waves with the wavelength of 530 nm; the length-diameter ratio of the third gold nanorod can be 6.3, and the third gold nanorod forms a grating structure under the irradiation of light waves with the wavelength of 460 nm.
Therefore, after three gold nanorods with different length-diameter ratios are doped, full-color holographic display of tricolor light is formed by red light, green light and blue light. When other color ratios are adopted to change the wavelength or the number of the primary light, the gold nanorods with the length-diameter ratio matched with the primary light can be correspondingly selected for doping, and the principle can be referred to above, and is not described herein again.
In the holographic display material provided by the embodiment of the invention, the monomer 104 can adopt methyl methacrylate C (CH)3)(CH2)COOCH3(MMA) or acrylamide (PVA). In addition, other single substances having the same function may be substituted, and the embodiment of the present invention is not limited herein.
The holographic display material provided by the embodiment of the invention can be made into a holographic sheet and applied to a holographic display system, and the holographic sheet is made by four steps of mixing, filtering, pre-polymerizing and curing. Firstly, mixing a monomer, a high molecular adhesive and a photosensitizer together, heating and stirring; then, filtering impurities in the mixture and removing the impurities to obtain suspension; then, adding the gold nanorods into the suspension, heating the suspension in an oil bath pot until the color of the suspension is changed into light yellow, and taking out the suspension; and finally, injecting the light yellow liquid into a mold, baking the light yellow liquid in an oven to a solid state, and taking out the light yellow liquid. Therefore, the holographic plate made of the holographic display material has high diffraction efficiency.
In a second aspect of the embodiments of the present invention, there is provided a holographic display system, as shown in fig. 3, the holographic display system provided by the embodiments of the present invention includes: the holographic optical system comprises a first light source device 10, a first optical modulation component 20 positioned on the light-emitting side of the first light source device 10, and a holographic plate 30 positioned on the light-emitting side of the first optical modulation component 20. The first optical modulation component 20 is configured to split the received light emitted from the first light source device 10 into two coherent light beams and emit the two coherent light beams to the hologram 30; the hologram 30 may be made of the holographic display material described above.
In the holographic display system provided by the embodiment of the invention, the holographic sheet is made of the holographic polymer material doped with the gold nanorods. Compared with the holographic display material which is not doped with gold nanorods in the prior art, the diffraction efficiency of the holographic display material provided by the embodiment of the invention is improved by 29.6%, and compared with the holographic display material which is doped with gold nanorods, the diffraction efficiency of the holographic display material provided by the embodiment of the invention is improved by 18.5%. And the holographic display material adopting the doped gold nanorods also has higher excellence in angle selectivity in specific application. The wavelength selectivity of the holographic display material can be realized by doping metal nanorods with different length-diameter ratios. Therefore, the holographic display material provided by the embodiment of the invention can be applied to full-color holographic display.
In particular implementation, as shown in fig. 4, the first optical modulation assembly 20 includes: the polarization beam splitter 201 includes an electronic switch 202, a spatial light modulator 203, a phase retarder 204 located on the light exit side of the spatial light modulator 202, and a reflector 205 located on the reflection light path of the polarization beam splitter 201, which are sequentially disposed on the transmission light path of the polarization beam splitter 201.
Wherein the polarization beam splitter 201 is configured to split incident light into transmitted light having a first polarization direction and reflected light having a second polarization direction; the first polarization direction and the second polarization direction are vertical to each other;
an electronic switch 202 for controlling the on-off of the light path;
a spatial light modulator 203 for modulating incident light and emitting the modulated light to the phase retarder;
the phase retarder 204 is used for delaying the phase of incident light by odd times of pi and emitting the incident light to the holographic plate;
and a reflector 205 for reflecting incident light to the full display.
Specifically, the polarization beam splitter 201, as shown in fig. 5, may include: two tetrahedrons 2011 oppositely arranged along the bottom surfaces, a plurality of polarizing plates 2012 stacked on the bottom surface of one of the tetrahedrons, and an adhesive layer 2013 between the bottom surfaces of the two tetrahedrons 2011 for adhering the two tetrahedrons. The polarizing beam splitter 201 is used to split an incident beam into two linearly polarized beams with polarization directions perpendicular to each other, so that one of the beams can be used as a subsequent object beam and the other as a reference beam for writing holographic optical field information into a hologram. In practical application, other representations except the bottom surface of the tetrahedron 2011 can be coated with an antireflection film, so that the transmission of light is enhanced, and the utilization efficiency of light energy is improved. One bottom surface of the two tetrahedrons 2011 glued with each other can be used as a semi-transparent surface for reflecting and refracting light, a multilayer polarizer can be arranged on the bottom surface, after the incident light beam is subjected to transmission and reflection processes for a plurality of times on the surface, the incident light beam is separated according to polarization phase, and two separated linearly polarized light beams with different light polarization states are separated. In general, p-polarized light passes completely through, while s-polarized light is reflected at a 45 degree angle, exiting at a 90 degree angle to the p-light. The light beam after passing through the polarization beam splitter 201 is split into two beams: one beam is p light and is emitted to one side of the electronic switch 201 and the spatial light modulator 203 after being completely transmitted; the other beam is s-beam, which is reflected and then emitted to the reflector 205 side.
Further, in the implementation, the electronic switch 202 and the spatial light modulator 203 may be connected to a processor (not shown in the figure), and the electronic switch 202 is used for controlling the on/off of the light path according to the instruction of the processor. When the electronic switch 202 is in the on state, the transmitted beam may be modulated by the spatial light modulator 203 and emitted to the hologram 30, thereby interfering with the reflected light to write holographic field information into the hologram. When the electronic switch 202 is in the off state, only the reflected light beam from the polarization beam splitter 201 exists in the light path, and when the hologram after holographic optical field information is written is irradiated with the same reflected light beam, reconstructed optical field information can be obtained in the direction of transmitted light, so that holographic display is realized.
The spatial light modulator 203 is used for loading the hologram, and under the modulation of the hologram, the light field emitted by the spatial light modulator 203 carries information, and when reaching the hologram, the information interferes with the light beam reflected by the polarization beam splitter 201, so that the light field information is written in the hologram. In one implementation, a digital micromirror device may be used as the spatial light modulator of the system. Its advantages are high response speed and high diffraction efficiency. In addition, the spatial light modulator 203 may also use a liquid crystal on silicon device, which has a higher resolution and can directly adjust and control the phase.
The phase retarder 204 functions to retard the phase of the outgoing light beam of the spatial light modulator 203 by an odd multiple of pi. Of the two linearly polarized light beams split by the polarization beam splitter 201, the transmitted light beam is modulated by the spatial light modulator 203 and then serves as the object light, and the reflected light beam serves as the reference light. However, the polarization directions of the two linearly polarized lights decomposed by the polarization beam splitter are perpendicular to each other, and only when the polarization states of the object light and the reference light are the same, interference can occur on the surface of the hologram so as to write holographic optical field information carried by the object light. Therefore, a phase retarder 204 is required to be disposed after the optical path of the spatial light modulator 203 to convert the transmitted p light into s light so that the polarization direction of the transmitted p light is the same as that of the reflected s light. In practical implementation, the phase retarder 204 may be a half-wave plate, and other devices with a phase retardation function, such as a liquid crystal lens, may also be used, and is not limited herein.
The reflector 205 may be a plane mirror, and only has the function of turning the optical path, so that the reference light is reflected and then enters the hologram, and the reference light may interfere with the object light to write the holographic field information into the hologram.
The holographic display systems shown in fig. 3 and 4 comprise only one light source device, and generally only emit light in a single wavelength band, which is not enough to realize full-color holographic display. If full-color holographic display is to be realized, light rays with various wave bands are required to be emitted as primary light, holographic light field information of the primary light rays is respectively written into a holographic film, and full-color display can be realized after light field reconstruction is carried out.
In one practical aspect, as shown in fig. 6, the optical modulation element located on the light emitting side of the first light source device (in fig. 6, the first light source device is 11) is a first optical modulation element 21.
The hologram sheet includes: the first hologram 31, the second hologram 32 and the third hologram 33 are different in aspect ratio of the gold nanorods in the first hologram 31, the second hologram 32 and the third hologram 33. For example, the sensing wavelength of the gold nanorods doped in the first hologram 31 is red light, the sensing wavelength of the gold nanorods doped in the second hologram 32 is green light, and the sensing wavelength of the gold nanorods doped in the third hologram 33 is blue light.
The holographic display system further comprises: a second light source device 12, a second optical modulation element 22, a third light source device 13, a third optical modulation element 23, a first reflector 41, a first half mirror 51 and a beam splitter prism 60.
The wavelengths of the light emitted from the first light source device 11, the second light source device 12, and the third light source device 13 are different from each other; for example, the light emitted from the first light source device 11 is blue light, the light emitted from the second light source device 12 is green light, and the light emitted from the third light source device 13 is red light.
Further, the third optical modulation component 23 is located on the light-emitting side of the third light source device 13, and the third hologram 33 is located on the light-emitting side of the third optical modulation component 23; the first reflecting mirror 41 is located on the transmission light path of the third hologram 33, and is used for reflecting the transmission light of the third hologram 33 to the first half mirror 5.
The second optical modulation component 22 is positioned at the light-emitting side of the second light source device 12, and the second hologram 32 is positioned at the light-emitting side of the second optical modulation component 22; the first half mirror 51 is located on the transmission light path of the second hologram 32, and is configured to transmit the reflected light of the first reflecting mirror 41 to the beam splitter prism 60, and reflect the transmitted light of the second hologram 32 to the beam splitter prism 60.
The beam splitter prism 60 is located on the transmission light path of the first hologram 31, and is configured to reflect the outgoing light from the first half mirror 51 to a set position, and transmit the transmission light of the first hologram 31 to the set position.
In the holographic display system provided by the embodiment of the invention, color display is realized by adopting a plurality of holographic sheets, the holographic display system can be split into three independent monochromatic display systems, and the recording process can be three independent working records of the three systems. The holographic light field information of the tricolor light is independently written into the corresponding holographic film, and the writing processes are not interfered with each other. During the light field reproduction, the three-color components of the system are combined by the rightmost first reflector 41, the first half mirror 51 and the beam splitter prism 60, and a color holographic image is obtained at a set position. The holographic plate made of the holographic display material is a transmission type material. When the reference light illuminates the hologram, there are two reconstructed images, one in front of the hologram and the other behind the hologram, in conjugate relation. The hologram image viewed at the set position is a reconstructed image located behind the hologram.
The above-mentioned embodiment provided by the embodiment of the present invention adopts a plurality of holograms to perform full-color display, and in another implementable manner, a single hologram may be used to perform full-color display. The angle selectivity of the holographic display material is mainly used for realizing color display by using the single-chip holographic plate. The holographic display material is very sensitive to different light wave incidence angles, and as shown in fig. 7 a-7 c, when reference light a and object light b carrying holographic optical field information are incident to a hologram in the direction of fig. 7a, interference occurs on the surface of the hologram, and the holographic optical field information is written into the hologram. When performing light field reconstruction, as shown in fig. 7b, if the reference light a ' is incident on the hologram 30 at the same angle as the reference light a when writing the light field, the reconstructed light b ' can be obtained in the direction of the original object light, and the reconstructed hologram image can be viewed against the emitting direction of the reconstructed light b '. However, if the angle at which the reference light a' is incident on the hologram 30 is slightly shifted at the time of light field reconstruction, as shown in fig. 7c, the intensity of diffracted light is greatly reduced and rapidly reduced to 0, and a reconstructed light field cannot be obtained.
Thus, in practical applications, a holographic display system architecture can be constructed using a single piece of holographic plate and using the angular selectivity of the holographic plate.
Specifically, when the scheme of the single-plate hologram is adopted, as shown in fig. 8, the holographic display system further includes: a fourth light source device 14, a fifth light source device 15, a second mirror 42 and a second half mirror 52. The wavelengths of the light emitted from the first light source device 11, the fourth light source device 14, and the fifth light source device 15 are different from each other.
The first light source device 11, the fourth light source device 14 and the fifth light source device 15 are arranged in a row, and the light emitting directions are the same, and the fourth light source device 14 is located between the first light source device 11 and the fifth light source device 15.
The second reflector 42 is located on the light-emitting side of the fifth light source device 15 and is used for reflecting the emergent light of the fifth light source device 15 to the second half mirror 52;
the second half mirror 52 is located on the light emitting side of the fourth light source device 14, and is configured to transmit the reflected light of the second reflecting mirror 42 to the polarization beam splitter 201, and reflect the emitted light of the fourth light source device 14 to the polarization beam splitter 201.
As shown in fig. 8, the reflector 205 is provided with a rotation axis r, the light emitted from the first light source device 11, the fourth light source device 14, and the fifth light source device 15 enters the polarization beam splitter in a time-sharing manner, and the rotation angles of the reflector 205 at different timings are different.
In practical use, primary lights (such as red, green and blue lights) of different colors are incident to the hologram according to different angles to record corresponding light field information. On one hand, the optical path can be built more easily, and on the other hand, due to the existence of angle selectivity, information among different lights cannot generate crosstalk to cause reconstruction errors. The specific work flow of holographic light field information recording is as follows: turning on the first light source device 11, turning on the electronic switch 202, setting the rotation angle of the rotating shaft r to-3 degrees, loading a hologram of a first primary color light component (such as a red light component) after emergent light of the first light source device passes through the spatial light modulator 203, and recording holographic light field information of the first primary color light component at an angle of-3 degrees on the hologram; turning off the color 11 of the first light source device, turning on the fourth light source device 14, turning on the electronic switch 202, setting the rotation angle of the rotating shaft r to be 0 degree, loading a hologram of a second primary color light component (such as a green light component) after emergent light of the fourth light source device passes through the spatial light modulator 203, and recording holographic light field information of the second primary color light component under the angle of 0 degree on the hologram; turning off the color 14 of the fourth light source device, turning on the fifth light source device 15, turning on the electronic switch 202, setting the rotation angle of the rotating shaft r to 3 degrees, loading a hologram of the third primary color light component (such as a blue color light component) after the emergent light of the fifth light source device passes through the spatial light modulator 203, and recording the holographic optical field information of the third primary color light component under the angle of 3 degrees on the hologram. When holographic light field information is reproduced, the working flow is as follows: turning on the first light source device 11, turning off the electronic switch 202, setting the rotation angle of the rotating shaft r to be-3 degrees, and obtaining a reconstructed holographic image of the first primary color light on the transmission light path of the holographic sheet; turning off the first light source device 11, turning on the fourth light source device 14, turning off the electronic switch 202, setting the rotation angle of the rotating shaft r to be 0 degree, and obtaining a reconstructed holographic image of second primary color light on a transmission light path of the holographic sheet; turning off the fourth light source device 14, turning on the fifth light source device 15, turning off the electronic switch 202, setting the rotation angle of the rotating shaft r to be 3 degrees, and obtaining a reconstructed holographic image of the third primary color light on the transmission light path of the holographic plate. The human eyes have a persistence effect, so that a fused image with three-color reconstructed holographic images can be obtained, and full-color display is realized.
Therefore, by adopting the holographic display system provided by the embodiment of the invention, the gold nanorods with various length-diameter ratios are doped in the holographic sheet, and the gold nanorods are sensitive to primary color light waves and are incident into the holographic sheet at various angles to write and reconstruct holographic light field information, so that the crosstalk effect is reduced.
Further, when each of the light source devices described above employs a laser light source device, as shown in fig. 9, the holographic display system further includes: a color filter wheel 206 located between the electronic switch 202 and the spatial light modulator 203. Because the on-off speed of the laser light source device is low, the color filter wheel can be arranged in the light path, and when the primary color light with different colors is used for writing or reconstructing the holographic light field information, the corresponding color area in the color filter wheel is aligned to the light path.
In specific implementation, as shown in fig. 10, each light source device includes: a light source 101, a spatial filter 102 and a collimating lens group 103 arranged in this order in the light emitting direction of the light source 101.
As described above, the light source 101 may be a laser, and may be a partially coherent light source such as a Light Emitting Diode (LED). Compared with the laser used as a light source, the LED has the advantages that the response speed of the LED is very high, and the on-off can be conveniently controlled; and the LED coherence is weaker than the laser coherence, so that speckle noise caused by the coherence can be effectively reduced. The laser is used as the light source, so that the coherence of the laser is strong, elements such as a filter and the like do not need to be arranged in a light path to enhance the coherence, the energy of the laser is high, the divergence angle is small, the collimation is good, and excessive energy loss is avoided.
Since light emitted from the light source 101 is interfered by other scattered light, a spatial filter 102 is provided on the light emitting side of the light source 101 to filter the unnecessary light. The light wave emitted after passing through the spatial filter 102 is a spherical wave. After passing through the collimating lens group 103, the wave is converted into a collimated plane wave.
As shown in fig. 11, the spatial filter may include: a converging lens group 1021 arranged in this order along the light exit direction, and a pinhole 1022 located on the light exit side of the converging lens group 1021.
The converging lens group 1021 may be a microscope objective, which functions to converge the light beam. The light emitted from the light source 101 enters the converging lens set 1021, and then is converged into a very small light spot. The pinhole 1022 is a circular hole with a very small size, for example, the diameter of the pinhole may be 15 μm, and functions to filter stray light interference. Under the action of dust and water vapor in the air, emergent light of the light source is partially converged into a small light spot, and a part of scattered light exists, so that the light spot converged by the condensing lens group 1021 is exactly positioned in the center of the pinhole 1022, stray light can not pass through, and a filtering effect is achieved. The positional relationship between the converging lens group 1021 and the pinhole 1022 can be adjusted by a mechanical structure. The collimating lens group 103 may be a convex lens for collimating incident light, and besides, the spatial filter and the collimating lens group may also be other structures having the same function, which is not limited herein.
In a third aspect of the embodiment of the present invention, a holographic display method based on any one of the above holographic display systems is provided, as shown in fig. 12, the holographic display method provided in the embodiment of the present invention may include:
s10, in the holographic light field information writing stage, controlling the first light source device to emit emergent light with first power, controlling the first optical modulation component to split the emergent light of the first light source device into a first light beam and a second light beam to emit to the holographic chip, and writing holographic light field information in the holographic chip;
s20, in the holographic light field information reconstruction stage, controlling the first light source device to emit emergent light with second power, and controlling the first optical modulation component to convert the emergent light of the first light source device into a second light beam to be emitted to the holographic sheet so as to realize holographic display;
wherein the first light beam is coherent with the second light beam, and the first power is greater than the second power.
The two necessary stages of holographic display are the writing stage of holographic light field information and the reconstruction stage of holographic light field information. When the holographic film made of the holographic display material provided by the embodiment of the invention is used for holographic display, two beams of coherent light are required to be simultaneously incident into the holographic film in the writing stage of holographic light field information, wherein a first light beam can carry modulated holographic light field information, a second light beam is used as a reference light beam, and a first light source device can be set to operate at medium power; in the reconstruction stage of the holographic light field information, the reconstructed holographic light field can be obtained in the object light direction only by injecting the reference beams with the same injection angle into the holographic sheet, and at the moment, only one reference beam is injected, and the first light source device can meet the requirement when running in a low-power state. Therefore, the first power of the light emitted from the first light source device needs to be larger than the second power when the holographic display is performed.
Referring to fig. 10, an optical modulation assembly in a holographic display system includes: the polarization beam splitter 201 includes an electronic switch 202, a spatial light modulator 203, a phase retarder 204 located on the light exit side of the spatial light modulator 203, and a reflector 205 located on the reflection light path of the polarization beam splitter 201, which are sequentially disposed on the transmission light path of the polarization beam splitter 201.
In a specific implementation, in step S10, the controlling the first optical modulation component to split the light emitted from the first light source device into the first light beam and the second light beam and emit the first light beam and the second light beam to the hologram, specifically includes:
the electronic switch is started, emergent light of the first light source device is controlled to pass through the spatial light modulator and the phase retarder after being transmitted by the polarization beam splitter to form a first light beam, and the emergent light of the first light source device passes through the reflector after being reflected by the polarization beam splitter to form a second light beam and is emitted to the holographic plate;
in the above step S20, the controlling the first optical modulation component to convert the outgoing light of the first light source device into the second light beam to be emitted to the hologram, includes:
and closing the electronic switch, controlling emergent light of the first light source device to be reflected by the polarization beam splitter and then pass through the reflector to form a second light beam, and emitting the second light beam to the holographic plate.
In the embodiment of the invention, the hologram is divided into m × n parts which are respectively numbered as [ H1.1] - [ Hm.n ] in the writing process of the holographic information, the electronic switch 202 is kept in an on state, the first light source device has the first power of emission, when the hologram of [ H1.1] is loaded on the spatial light modulator 203, the transmission P light of the polarization beam splitter 201 carries the H1.1] information after passing through the spatial light modulator 203, the hologram is subjected to the holographic reflection, and the hologram is subjected to the holographic reflection, so that the hologram is subjected to the holographic reflection, and the hologram reflection, the hologram reflection light, the hologram, the transmission P light, the transmission light, the hologram, the transmission P light, the hologram, the transmission light, the hologram, the reflection light, the hologram, the reflection light, the hologram, the reflection light, the hologram, the reflection light, the hologram, the reflection light, the hologram, the reflection light, the reflection, the hologram, the reflection light, the reflection, the hologram.
It should be noted that, because the refresh rate of the spatial light modulator 203 is limited, if a larger display area is to be obtained, the light can be modulated by connecting a plurality of spatial light modulators 203 in parallel.
If the first beam after passing through the spatial light modulator 203 carries the light field information represented by O (x.y) and the second beam as the reference light wave represented by R (x.y), the light field information in the hologram can be represented by (O (x.y) + R (x.y))2And (4) showing.
During the holographic light field information reconstruction phase, the electronic switch 202 remains off. In the reconstruction display process, the monomer in the holographic plate is not required to generate polymerization reaction again, and only the second light beam serving as the reference light is required to irradiate the holographic plate to generate a diffraction light field, so that the first light source device only needs to operate at the second power with low power. Since the electronic switch 202 is turned off, the reflected light from the polarization beam splitter 201 is reflected by the reflector 205 and then exits to the hologram, and the light field after the second light beam irradiates the hologram can be expressed as:
O(x.y)R*(x.y)R(x.y)+O(x.y)R(x.y)R(x.y)+O(x.y)2R(x.y)+R(x.y)2R(x.y)；
wherein the first term of the formula O (x.y) R*And (x.y) R (x.y) is the three-dimensional image information to be displayed, and a vivid three-dimensional image can be seen when the three-dimensional image information is viewed at a proper position. The second term O (x.y) R (x.y) R (x.y) of the formula represents the reconstructed light wave conjugated with the object light, and the third term O (x.y) of the formula2R (x.y) represents a light wave similar to the reference light, and the fourth term R (x.y) of the formula2R (x.y) represents the reconstructed light wave conjugated to the third term.
A holographic display image of the reconstructed light field can be viewed in the direction of the above-mentioned first beam of object light.
Further, the holographic display material used in the holographic display system provided in the embodiment of the present invention further has a function of erasing light field information, and therefore, in the holographic display method provided in the embodiment of the present invention, the method further includes:
in the holographic light field information erasing stage, controlling the first light source device to emit emergent light with third power, turning off the electronic switch, and controlling the emergent light of the first light source device to emit to the holographic plate after being reflected by the polarization beam splitter and the reflector; wherein the third power is greater than the first power.
In the erasing phase of the holographic light field information. The electronic switch 202 remains closed. When the high-power pulse type emergent light is adopted to uniformly illuminate the holographic film, chemical reaction can also occur, the chemical bond of the polymer is broken, and the monomer can reappear at the moment. The monomer is generated to increase the chemical potential of the original dark area, the gold nanorods are finally uniformly diffused into the whole material again, and the light field information is erased. Therefore, the first light source device is in a high-power pulse operation state at this time, and the emitted third power needs to be larger than the first power and the second power. The light reflected by the polarizing beam splitter 201 reaches the hologram after being reflected by the reflector 205, and the holographic light field information in the hologram can be erased. Therefore, the holographic film can wait for the next writing of the light field information, and repeat the processes of writing, reconstructing and erasing the light field information, thereby realizing the display of different holographic images.
The embodiment of the invention provides a holographic display material, a holographic display system and a holographic display method thereof, wherein the holographic display material comprises: the light-sensitive optical fiber comprises a mixture consisting of polymer powder, a monomer and a photosensitizer, and gold nanorods dispersed in the mixture; the length-diameter ratio of the gold nanorods meets the requirement of forming a grating structure under the irradiation of light waves with set wavelength or wavelengths. The doped gold nanorods enable the holographic display material obtained after doping to have higher diffraction efficiency. The gold nanorods have more degrees of freedom, and the polymer nanocomposite can be optimized by utilizing the shape dependence of the gold nanorods. Because the gold nanorods have two space dimensions of length and width, the surface plasmon resonance of the gold nanorods has two modes, namely longitudinal surface plasmon resonance and transverse surface plasmon resonance. The dual resonance has the advantages of enhanced absorption, optical gain, amplified spontaneous emission, prominent angular selectivity, and the like.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (15)
1. A holographic display material, comprising: the light-sensitive optical fiber comprises a mixture consisting of polymer powder, a monomer and a photosensitizer, and gold nanorods dispersed in the mixture;
the length-diameter ratio of the gold nanorods meets the condition of forming a grating structure under the irradiation of light waves with set one or more wavelengths.
2. The holographic display material of claim 1, in which the gold nanorods comprise at least: a first gold nanorod, a second gold nanorod and a third gold nanorod;
the length-diameter ratio of the first gold nanorod meets the condition of forming a grating structure under the irradiation of red light;
the length-diameter ratio of the second gold nanorod meets the condition of forming a grating structure under the irradiation of green light;
the length-diameter ratio of the third gold nanorod meets the condition of forming a grating structure under the irradiation of blue light.
3. The holographic display of claim 2, in which the first gold nanorods have an aspect ratio of 1.1, and form a grating structure under irradiation of a light wave with a wavelength of 630 nm;
the length-diameter ratio of the second gold nanorod is 3.4, and the second gold nanorod forms a grating structure under the irradiation of light waves with the wavelength of 530 nm;
the length-diameter ratio of the third gold nanorod is 6.3, and the third gold nanorod forms a grating structure under the irradiation of light waves with the wavelength of 460 nm.
4. The holographic display of claim 1, in which the monomer is methyl methacrylate or acrylamide.
5. A holographic display system, comprising: the holographic film comprises a first light source device, a first optical modulation component and a holographic film, wherein the first optical modulation component is positioned on the light-emitting side of the first light source device;
the first optical modulation component is used for splitting the received emergent light of the first light source device into two beams of coherent light to be emitted to the holographic plate;
the hologram is made of the holographic display material according to any of claims 1 to 3.
6. The holographic display system of claim 5, in which the first optical modulation component comprises: the system comprises a polarization beam splitter, an electronic switch, a spatial light modulator, a phase retarder positioned on the light-emitting side of the spatial light modulator and a reflector positioned on the reflection light path of the polarization beam splitter, wherein the electronic switch and the spatial light modulator are sequentially arranged on the transmission light path of the polarization beam splitter;
the polarization beam splitter is used for splitting incident light into transmission light with a first polarization direction and reflection light with a second polarization direction; the first polarization direction and the second polarization direction are perpendicular to each other;
the electronic switch is used for controlling the on-off of the light path;
the spatial light modulator is used for modulating incident light and then emitting the modulated incident light to the phase retarder;
the phase delayer is used for delaying the phase of incident light by odd times of pi and emitting the incident light to the holographic plate;
the reflector is used for reflecting incident light to the full display piece.
7. The holographic display of claim 6, in which the optical modulation component at the light exit side of the first light source device is a first optical modulation component;
the hologram sheet includes: a first hologram, a second hologram, and a third hologram; the length-diameter ratios of the gold nanorods in the first holographic plate, the second holographic plate and the third holographic plate are different;
the holographic display system further comprises: the second light source device, the second optical modulation component, the third light source device, the third optical modulation component, the first reflector, the first half-transmitting and half-reflecting mirror and the beam splitting prism;
the wavelengths of the emergent light of the first light source device, the second light source device and the third light source device are different;
the third optical modulation component is positioned at the light emergent side of the third light source device, and the third holographic plate is positioned at the light emergent side of the third optical modulation component; the first reflector is positioned on the transmission light path of the third holographic plate and used for reflecting the transmission light of the third holographic plate to the first half mirror;
the second optical modulation component is positioned at the light-emitting side of the second light source device, and the second holographic plate is positioned at the light-emitting side of the second optical modulation component; the first half mirror is positioned on the transmission light path of the second holographic plate and used for transmitting the reflection light of the first reflector to the beam splitter prism and reflecting the transmission light of the second holographic plate to the beam splitter prism;
the beam splitting prism is located on a transmission light path of the first holographic plate and used for reflecting emergent light of the first half-transmitting half-reflecting mirror to a set position and transmitting transmission light of the first holographic plate to the set position.
8. The holographic display system of claim 6, in which the holographic display system further comprises: the second light source device is arranged on the second reflector;
the wavelengths of the emergent light of the first light source device, the fourth light source device and the fifth light source device are different;
the first light source device, the fourth light source device and the fifth light source device are arranged in a row, the light emitting directions are the same, and the fourth light source device is positioned between the first light source device and the fifth light source device;
the second reflector is positioned on the light-emitting side of the fifth light source device and used for reflecting the emergent light of the fifth light source device to the second half mirror;
the second half mirror is positioned on the light-emitting side of the fourth light source device and used for transmitting the reflected light of the second mirror to the polarization beam splitter and reflecting the emitted light of the fourth light source device to the polarization beam splitter;
the reflector is provided with a rotating shaft, emergent light of the first light source device, the fourth light source device and the fifth light source device is incident to the polarization light splitter in a time-sharing mode, and the rotating angles of the reflector under different time sequences are different.
9. The holographic display of claim 8, in which each light source device is a laser light source device;
the holographic display system further comprises: a color filter wheel positioned between the electronic switch and the spatial light modulator.
10. Holographic display of any of claims 5 to 9, in which each light source arrangement comprises: the light source, the spatial filter and the collimating lens group are arranged in sequence along the light emergent direction of the light source.
11. The holographic display system of claim 10, in which the spatial filter comprises: a converging lens group and a pinhole at the light-emitting side of the taking lens group.
12. The holographic display of any of claims 6-9, in which the polarizing beam splitter comprises: two tetrahedrons oppositely arranged along the bottom surfaces, a plurality of polarizing plates stacked on the bottom surface of one of the tetrahedrons, and an adhesive layer between the bottom surfaces of the two tetrahedrons for bonding the two tetrahedrons.
13. A holographic display method based on the holographic display system of any of claims 5-12, comprising:
in the holographic optical field information writing stage, controlling a first light source device to emit emergent light with first power, controlling a first optical modulation component to decompose the emergent light of the first light source device into a first light beam and a second light beam to emit to a holographic sheet, and writing holographic optical field information in the holographic sheet;
in the holographic light field information reconstruction stage, the first light source device is controlled to emit emergent light with second power output, and the first optical modulation component is controlled to convert the emergent light of the first light source device into a second light beam to emit to the holographic sheet so as to realize holographic display;
wherein the first light beam is coherent with the second light beam, the first power being greater than the second power.
14. The holographic display method of claim 13, in which the first optical modulation component comprises: the system comprises a polarization beam splitter, an electronic switch, a spatial light modulator, a phase retarder positioned on the light-emitting side of the spatial light modulator and a reflector positioned on the reflection light path of the polarization beam splitter, wherein the electronic switch and the spatial light modulator are sequentially arranged on the transmission light path of the polarization beam splitter;
the controlling the first optical modulation component to split the emergent light of the first light source device into a first light beam and a second light beam to be emergent to the holographic plate comprises the following steps:
the electronic switch is turned on, emergent light of the first light source device is controlled to pass through the spatial light modulator and the phase retarder after being transmitted by the polarization beam splitter to form a first light beam, and the emergent light of the first light source device is reflected by the polarization beam splitter and then passes through the reflector to form a second light beam to be emitted to the holographic plate;
the control the first optical modulation component converts the emergent light of the first light source device into the second light beam to be emergent to the holographic plate, and the control method comprises the following steps:
and closing the electronic switch, controlling emergent light of the first light source device to pass through the polarizing beam splitter to be reflected and then pass through the reflector to form a second light beam, and emitting the second light beam to the holographic plate.
15. The holographic display method of claim 14, further comprising:
in the holographic light field information erasing stage, the first light source device is controlled to emit emergent light with third power, the electronic switch is closed, and the emergent light of the first light source device is controlled to emit to the holographic plate after being reflected by the polarization beam splitter and the reflector;
the third power is greater than the first power.
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