A large field angle holographic stereogram rapid recording method, material and device

Abstract

The application discloses a large-viewing-angle holographic stereogram rapid recording method, material and device. The method comprises the following steps: sampling parallax maps of a three-dimensional scene or a real scene to obtain a plurality of parallax map sequences; dividing the parallax map sequences into two groups, and performing batch image preprocessing on the two groups of parallax map sequences respectively; performing pixel cycle extraction and recombination on the two groups of preprocessed parallax maps to obtain two groups of holographic unit sequences. The first group of holographic units is recorded by interference with reference light scanning on an ultra-high-sensitivity holographic material through a device. After the first group of holographic units is recorded, the light beam angle deflector in the recording device is rotated by a certain angle, the reference light is incident from the other side, and the second group of holographic units is recorded by scanning. Compared with related technologies, the holographic recording method for splicing a reproduction viewing angle can obtain a reproduction viewing angle which is twice that of a traditional method, and has high diffraction efficiency and recording efficiency.

Description

Technical Field

[0001] This invention relates to a method, materials, and apparatus for rapid recording of holographic volume images with a large field of view, belonging to the field of holographic three-dimensional display. Background Technology

[0002] In recent years, with the closer integration of computer technology and holographic technology, holographic printing technology has developed rapidly. Compared with traditional optical holography, holographic printing technology can store the three-dimensional information of virtual scenes on holographic recording media. Currently, holographic printing technology has been widely used in commerce, military, medical, and advertising industries.

[0003] Traditional 3D displays are primarily based on the principle of binocular parallax. By wearing assistive devices, the human eye receives two images with a certain parallax, which are then fused by the brain to form a three-dimensional image. However, binocular parallax-based 3D displays have significant drawbacks, including the need for assistive devices, a limited viewing window, and discomfort after prolonged viewing. Therefore, more and more researchers are focusing on achieving ideal 3D displays—that is, obtaining the same three-dimensional sense as real objects without the need for assistive devices. Thus, glasses-free 3D display technology is a future trend and a major research direction.

[0004] Holographic printing essentially approximates a continuous three-dimensional object using finite, discrete two-dimensional images. It discretizes a three-dimensional scene into two-dimensional parallax images, samples the parallax image sequence as pixels or pixel blocks, re-encodes it into a sequence of holographic units, and then records these holographic units onto a holographic material through lens-based convergence interference. Using white light or a reference light, the light diffracts with the convergence angle during recording, reproducing different parallax images at different angles. When the order of parallax image reproduction reasonably corresponds to changes in the viewing angle, and the reproduced parallax images are seamless, a visual experience of a three-dimensional scene can be obtained.

[0005] Technical indicators for measuring the quality of 3D scene reconstruction include: sharpness, resolution, contrast, uniformity of the reconstructed 3D scene, reconstructed viewing angle, and diffraction efficiency.

[0006] The resolution of a holographic reconstruction primarily depends on the number of recorded holographic units. A holographic volume view reconstruction is composed of diffraction from an array of holographic units; one holographic unit corresponds to one pixel in the holographic volume view. The more holographic units recorded, the higher the resolution of the holographic volume view reconstruction. The reconstruction resolution is also positively correlated with the area size of the holographic units; smaller holographic unit areas result in more holographic units per unit area, leading to higher reconstruction resolution. If the sampling range of a 3D scene exceeds the reconstruction viewing angle, the reconstructed 3D scene will exhibit blurring and distortion because more than two parallax images are reproduced at the same angle, causing crosstalk in the reconstruction effect. A larger viewing angle allows for the clear reproduction of more and more information from the 3D scene.

[0007] The reconstructed field of view depends on the converging angle of the converging lens, which is proportional to the lens's focal length. Traditional methods require shorter focal length lenses to achieve a larger reconstructed field of view. However, short-focal-length, large-size lenses are complex to manufacture, expensive, and prone to causing severe image distortion, making it difficult to achieve a reconstructed field of view of 90°.

[0008] Domestic and international researchers and teams have been dedicated to expanding the field of view of holographic volume views. In 2016, the Russian team AY Zherdev et al. designed a method that uses holographic optical elements as diffraction lenses, employing diffraction instead of refraction, to expand the field of view to 120°. Also in 2016, Cao Liangcai's team at Tsinghua University used angle multiplexing technology to expand the spatial bandwidth product of holograms, obtaining a larger reconstruction field of view.

[0009] The above methods have certain limitations. Holographic optical elements have lower transmittance than glass lenses, which reduces image quality, and their fabrication is more challenging. Holographic multiplexing technology depends on the dynamic range of the recording material, and its effectiveness largely depends on the holographic recording material. As the number of multiplexed elements increases, the re-phenomenon diffraction efficiency is affected. Summary of the Invention

[0010] In order to solve the problems of the prior art, the purpose of this invention is to overcome the shortcomings of the existing technology and provide a method, material and device for rapid recording of holographic volume view with a large field of view, which can obtain a holographic volume view with twice the field of view compared with the traditional recording method.

[0011] To achieve the above-mentioned objectives, the concept of this invention is as follows: The method for rapid recording of a large field-of-view holographic volume view according to the present invention includes: Multiple disparity map sequences are obtained by sampling disparity maps from 3D or real-world scenes. The disparity map sequence was divided into two groups according to the increasing angle, and the two groups of disparity map sequences were preprocessed in batches. The two preprocessed disparity maps are subjected to pixel cyclic extraction and recombination to obtain two sets of holographic unit sequences for exposure; The device records the first group of holographic units on the holographic recording material by interfering with the reference light scanning. The holographic units are arranged closely in the vertical direction and are spaced apart by the distance of one holographic unit in the horizontal direction.

[0012] After completing the recording of the first set of holographic units, the beam angle deflector in the recording device is rotated by a certain angle so that the reference light is incident from the other side. At this time, the angle between the reference light and the reference light during the first set of recording is equal to the object light convergence angle.

[0013] The second group of holographic units is scanned and exposed sequentially to fill the blank spaces between the exposure arrays of the first group of holographic units. By developing, fixing, and bleaching the holographic material, a holographic volume view with a reconstructed field of view that is twice the convergence angle is obtained.

[0014] Preferably, the step of performing batch image preprocessing on the two sets of disparity map sequences specifically includes: A new disparity map is formed by extracting one column of pixels from the image every other column. The number of pixel columns in the new disparity map is half that of the image before preprocessing. The image is "narrowed". The preprocessing is performed cyclically on the two sets of disparity map sequences. Preferably, the two preprocessed disparity maps are subjected to pixel cyclic extraction and recombination to obtain two sets of holographic unit sequences for exposure, specifically including: Pixels at the same position in the disparity map are extracted and recombined to obtain a holographic unit sequence. This operation is repeated until all pixels in the disparity map are involved in encoding. The holographic unit sequence extracted from the first set of disparity maps is the first set of holographic units, and the holographic unit sequence extracted from the second set of disparity maps is the second set of holographic units. Preferably, the method of recording the first group of holographic units on the holographic recording material by interfering with the reference light scan using the device specifically includes: The first group of holographic units is sequentially loaded onto the display screen. The printing mechanism is controlled to perform scanning and exposure. The holographic units are closely arranged in the vertical direction and spaced apart by one column of holographic units in the horizontal direction. The position of the holographic units interferes with the reference light on the surface of the holographic recording material to record the data. The step of controlling the beam angle deflector in the recording device to rotate by a certain angle so that the reference light is incident from the other side specifically includes: The reference light is positioned so that its spatial position is coplanar with the horizontal rotation direction of the reconstructed image. The angle between the incident angle and the normal perpendicular to the holographic plate is controlled to be half the object light convergence angle, R / 2°. The first set of holographic units is then recorded. After recording the first set of holographic units, the incident angle of the reference light is changed so that the reference light rotates within the same plane by the same angle R° as the object light convergence. At this point, the reference light forms an angle of -R / 2° with the perpendicular line of the holographic plate, and the recording of the second set of holographic units begins.

[0015] The control reference light records the two sets of holographic units at different incident angles, specifically including: The reference light is positioned so that its spatial position is coplanar with the horizontal rotation direction of the reconstructed image. The angle between the incident angle and the normal perpendicular to the holographic plate is controlled to be half the object light convergence angle, R / 2°. The first set of holographic units is then recorded. After recording the first set of holographic units, the incident angle of the reference light is changed so that the reference light rotates within the same plane by the same angle R° as the object light convergence. At this point, the reference light forms an angle of -R / 2° with the perpendicular line of the holographic plate, and the recording of the second set of holographic units begins.

[0016] Optionally, the control platform movement method, which sets the recording positions of the two sets of holographic units on the surface of the holographic recording material, specifically includes: During the recording of the first set of holographic units, the XY-controlled 2D moving platform moves twice the holographic printing width in the X direction and once the holographic unit length in the Y direction each time. This ensures that the holographic unit recording array is such that the holographic units are closely connected in the Y direction and spaced apart by one column in the X direction. After completing the recording of the first set of holographic units, the platform is reset to the initial position and moves one step in the X direction, which is the starting position for the second set of holographic units. The same rule is followed to complete the exposure recording of the second set of holographic units until both sets of holographic unit arrays are recorded on the surface of the holographic material. Each pair of columns of holographic units from the same set is separated by a column of holographic units from the other set.

[0017] The present invention also provides a holographic volume view fabrication device for reproducing field angle stitching, comprising: an optical path system, an electrically controlled beam angle deflector, a control system, and an integrated structure.

[0018] The optical path system specifically includes: a 473nm blue laser, a 532nm green laser, and a 633nm laser; a dichroic filter, a semi-reflective mirror, an electronic shutter, and a polarizing beam splitter sequentially arranged on the laser's output optical path; an object optical path sequentially arranged on the polarizing beam splitter's reflected optical path, including: a first polarizer, a first beam expander, a first collimating lens, a scattering film, a display screen, a reflecting mirror, a 4f system, a converging objective lens, a first rectangular aperture, and an XY two-dimensional moving platform; a reference optical path arranged on the polarizing beam splitter's transmission optical path, including: a second beam expander, a second collimating lens, a first reflecting mirror, a second reflecting mirror, and a rotating reflecting mirror; and a first reflecting mirror, a second reflecting mirror, and a second movable rectangular aperture arranged on the rotating reflecting mirror's optical path.

[0019] Optionally, the beam angle deflector specifically includes: The system comprises a rotating platform, a reflector, and a servo motor. When the first set of holographic units completes recording, the servo motor is controlled to rotate by a fixed angle, causing the reflector fixed on the rotating platform to rotate around the axis of the circular platform by a certain angle, thus rotating the self-reflected beam by a certain angle and illuminating the second reflector.

[0020] Preferably, the control system specifically includes: When exposing the nth holographic unit in the first group, the nth holographic unit is loaded onto the display screen, and the XY two-dimensional moving platform is controlled to move the holographic unit a distance equal to its side length, while the electronic shutter is opened. If the exposed holographic unit is the last unit in a column, the XY two-dimensional moving platform is controlled to move the holographic unit a distance twice its side length. When the first group of holographic units is exposed, the beam angle deflector is controlled to rotate by a set angle to change the reflection direction from the reflected beam, and the moving aperture is controlled to move linearly a set distance. When the rotating mechanism has finished rotating, the second group of holographic units is exposed, and the control process is the same as the first group, with the control actions strictly following the sequential time order.

[0021] The integrated structure specifically includes: The optical components used for fixing the object beam path and the reference beam path are as follows: The dichroic filter, semi-reflective lens, electronic shutter, and polarizing beam splitter on the laser output beam path; the first polarizer, first beam expander, first collimating lens, scattering film, and display screen on the object beam path; and the second beam expander, second collimating lens, and first reflecting mirror on the reference beam path are fixed to a first horizontal plane. The reflecting mirror, 4f system, converging objective lens, and first rectangular aperture on the object beam path; and the second reflecting mirror on the reference beam path are fixed to a first vertical plane. The rotating mirror, first reflecting mirror, and second reflecting mirror on the rotating mirror path are fixed to a second horizontal plane, and the second movable rectangular aperture is fixed to a third horizontal plane. The holographic recording material fixes the XY two-dimensional moving platform, causing the object beam and reference beam to interfere from both sides on the holographic recording material surface. The control system hardware, including a PLC and a heat sink, is fixed at the bottom of the second horizontal plane and connected to the XY two-dimensional moving platform, electronic shutter, display screen, and laser, respectively.

[0022] Based on the above inventive concept, the present invention adopts the following technical solution: A method for rapid recording of a large field-of-view holographic volume view, comprising the following steps: (1) Sample the disparity map of the real scene or the virtual three-dimensional scene. The sampling angle range is twice the lens convergence angle. If the convergence angle is R°, then the sampling range is 2R°. The three-dimensional scene sampling yields multiple disparity map sequences, which are then divided into two groups according to the sampling angle; the first group consists of disparity maps with a sampling range of 0° to R°, and the second group consists of disparity maps with a sampling range of R° to 2R°. (2) Image preprocessing is performed on the two sets of disparity map sequences, specifically including: Extract one column of pixels from the image every other column to form a new disparity map. The number of pixel columns in the new disparity map is half that of the original disparity map. The preprocessing is performed cyclically on the two sets of disparity map sequences. (3) Sampling and encoding pixels or pixel blocks of the two preprocessed disparity maps to obtain holographic units for exposure; specifically including: Pixels at the same position in the disparity map are extracted and recombined to obtain a holographic unit sequence. This operation is repeated until all pixels in the disparity map are encoded. The holographic unit sequence extracted from the first set of disparity maps is the first set of holographic units, and the holographic unit sequence extracted from the second set of disparity maps is the second set of holographic units. (4) Adjust the beam angle deflector in the optical path to drive the mirror to rotate so that the reference light is incident at an angle R / 2°, which is half the angle of the converging lens in the horizontal and vertical directions. (5) Recording the first group of holographic units, specifically including: Preparation of ultra-high sensitivity holographic materials for rapid recording of large field-of-view holographic volume views; The first group of holographic units is sequentially loaded onto the display screen. The printing mechanism is controlled to perform scanning and exposure. The holographic units are closely arranged in the vertical direction and spaced apart by one column of holographic units in the horizontal direction. The position of the holographic units interferes with the reference light on the surface of the ultra-high sensitivity holographic recording material to record. (6) After the first group of holographic units completes recording, the high-precision rotating mechanism of the reflector in the control device rotates the reflector to a certain angle so that the reference light is incident at -R / 2°. (7) Scan and expose the second group of holographic units in sequence to fill the blank spaces between the exposure arrays of the first group of holographic units; complete the recording of the holographic volume view; (8) By post-processing the holographic material, a holographic volume view with a reconstructed field of view of twice the convergence angle 2R° is obtained.

[0023] Preferably, in steps (5) to (8), controlling the reference light to record the two sets of holographic units at different incident angles specifically includes: The reference light is positioned in the same plane as the horizontal rotation direction of the reconstructed image. The angle between the incident angle and the normal perpendicular to the holographic plate is controlled to be half the object light convergence angle, R / 2°. The first set of holographic units is recorded. When the first set of holographic units is recorded, the incident angle of the reference light is changed so that the reference light rotates in the same plane at the same angle R° as the object light convergence. At this time, the reference light forms an angle of -R / 2° with the vertical line of the holographic plate. The second set of holographic units is then recorded.

[0024] Preferably, in steps (5) to (8), controlling the platform's movement mode and setting the recording positions of the two sets of holographic units on the surface of the holographic recording material specifically includes: During the recording of the first set of holographic units, the XY electronically controlled two-dimensional moving platform moves twice the holographic printing width in the X direction and once the holographic unit length in the Y direction each time. This makes the holographic unit recording array such that the holographic units in the Y direction are closely connected and spaced apart by one column in the X direction. After completing the recording of the first set of holographic units, the platform is reset to the initial position and moves one step in the X direction, which is the starting position of the second set of holographic units. The exposure recording of the second set of holographic units is completed according to the same rule until the two sets of holographic unit arrays are recorded on the surface of the holographic material. In this case, every two columns of holographic units from the same set are separated by a column of holographic units from the other set.

[0025] More preferably, in steps (5) to (8), during diffraction reconstruction, a group of holographic units has a diffraction range with the same convergence angle R°, the diffraction ranges of the two groups of holographic units are connected, and the holographic volume view composed of the two groups of holographic units with alternating intervals has a reconstruction field of view of 2R°, specifically including: In the holographic unit array recorded by the holographic recording material, the holographic units in adjacent columns are respectively from different groups of holographic unit sequences in the two sets of holographic unit sequences; when the two sets of holographic units are recorded, the angles of interference between their object light and reference light are different, differing by the same convergence angle R°; when reproducing the holographic volume view, the field of view of the first set of holographic units is R°, and the angle between its angle bisector and the normal to the vertical holographic plate is R / 2°, while the second set of units is reproduced from the other side, with a field of view of R°, and the angle between its angle bisector and the normal to the vertical holographic plate is also R / 2°; when the first set of holographic units leaves the diffraction range, it immediately enters the diffraction range of the second set of holographic units, and the field of view of the two sets of holographic units is connected, expanding the field of view to twice that of the traditional recording method.

[0026] A high-sensitivity holographic material for rapid recording of large field-of-view holographic volume views, applied in the rapid recording method for large field-of-view holographic volume views described in this invention, is characterized in that: the high-sensitivity holographic material is a material doped with a small amount of calcium ions (Ca). 2+ Ions and doped formate ions HCO 2- Silver halide materials prepared by silver halide holographic emulsion; Ca ions are added during the precipitation stage of cubic AgBr emulsion preparation using a double-injection method, with the calcium doping concentration being 0.436%~0.87% of the silver ions; Ca(NO3)2·4H2O is used to avoid the influence of Cl ions on pAg; formate ions (HCO2) - As a "hole-electron converter", it is doped into silver halide with a doping concentration of 0.00001~0.0001 mol formate ions per mol of silver ions. The material has high photosensitivity.

[0027] Preferably, the ultra-high sensitivity holographic material is a polymethyl methacrylate (PQ-PMMA) photopolymer material doped with graphene oxide (GO) and phenanthrenequinone (PQ); the monomer used in the PQ-PMMA photopolymer is methyl methacrylate (MMA), the photosensitizer is phenanthrenequinone (PQ), the thermal initiator is azobisisobutyronitrile (AIBN), and the single-layer graphene oxide nanosheets are dissolved in 100ml of water, containing 100g of methyl methacrylate (MMA), 0.7g-1g of azobisisobutyronitrile (AIBN), 0.5-1.3g of phenanthrenequinone (PQ), and 0.0005-0.002g of graphene oxide (GO).

[0028] Preferably, the ultra-high sensitivity holographic material is dichromate gelatin (MBDCG) with an added mass percentage concentration of 0.001%~0.01% methylene blue sensitizer, using potassium dichromate sensitizer, and adding an appropriate amount of methylene (MB) dye as a sensitizer, and the organic reagent acrylamide as a pre-expansion agent.

[0029] Preferably, the ultra-high sensitivity holographic material, calculated by mass percentage concentration, is a photorefractive polymer PMMA:DTNBI:C. 60 It is composed of polymethyl methacrylate (PMMA), 33%–40% of 1,3-dimethyl-2,2-tetramethylene-5-nitrobenzimidazolin (DTNBI), and 0.12%–0.32% C. 60 The polymer is composed of 2,4,7-trinitro-9-fluoroenone (TNF) and methyl phenyl C61-butyrate (PCBM) in a total mass of 0.01% to 0.03%.

[0030] Preferably, the ultra-high sensitivity holographic material is TrO2 nanoparticles modified with sodium citrate at a mass percentage concentration of 0.112%~0.198% incorporated into a composite multifunctional monomer consisting of acrylamide (AA) and methylenebisacrylamide (BAA), with algae red dye as a photosensitizer, triethanolamine (TEA) as a photoinitiator, and polyvinyl alcohol (PVA) as a binder.

[0031] Preferably, the ultra-high sensitivity holographic material is an iron-doped lithium niobate Er:Fe:LiNbO3 ferroelectro-optic refractive material, with an iron doping concentration of 0.112~0.138 mol of iron ions per liter of solution; and erbium (Er) is incorporated as an activator, with an erbium doping concentration of 0.0115~0.115 mol of erbium ions per liter of solution.

[0032] A device for rapid recording of large field-of-view holographic volume view, implementing the rapid recording method of large field-of-view holographic volume view of the present invention, the device includes an optical path system, an electrically controlled beam angle deflector, a control system, and an integrated structure; The optical path system is used to synthesize red, green, and blue (RGB) laser light sources, carry holographic unit information, converge them onto the material surface, and record them by interference at different angles through coherent light; The beam angle deflector is used to drive the reflector to rotate at a set angle, and to reflect the incident beam in different directions before and after rotation. The control system is used for timing control of image loading, electronic shutter opening and closing, and XY two-dimensional moving platform movement, as well as for angle control of the beam angle deflector rotation and movement control of the movable rectangular aperture. The integrated structure is used to mount and fix the optical path system, the electronically controlled beam angle deflector, and the control system hardware and its wiring.

[0033] Compared with the prior art, the present invention has the following obvious and prominent substantive features and significant advantages: 1. This invention samples disparity maps from a 3D scene or a real scene to obtain multiple disparity map sequences; divides the disparity map sequences into two groups, performs batch image preprocessing on the two groups of disparity map sequences respectively; and performs pixel cyclic extraction and recombination on the two groups of preprocessed disparity maps to obtain two groups of holographic unit sequences. 2. The present invention records the first set of holographic units by interfering with the reference light scanning on an ultra-high sensitivity holographic material using a device; after the recording of the first set of holographic units is completed, the beam angle deflector in the recording device is rotated by a certain angle so that the reference light is incident from the other side, and the second set of holographic units is scanned and recorded. 3. The holographic recording method of reconstructing field of view stitching of the present invention can obtain twice the reconstruction field of view compared with the traditional method, while having high diffraction efficiency and recording efficiency; 4. The method of the present invention is simple, easy to implement, and low in cost, making it suitable for widespread use. Attached Figure Description

[0034] Figure 1 This is a flowchart of a method for creating a holographic volume view by splicing the reconstructed field of view, provided in a preferred embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the rotating reflector provided in a preferred embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of a holographic unit recording provided in a preferred embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram illustrating a preferred embodiment of the reconstructed field of view stitching in this invention.

[0038] Figure 5 This is an optical path diagram of a preferred embodiment of the present invention.

[0039] Figure 6 This is a structural diagram of a holographic volume view fabrication device for reproducing field-of-view stitching in a preferred embodiment of the present invention. Detailed Implementation

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0041] The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. The described embodiments are merely some, not all, of the embodiments of this invention.

[0042] The above solution will be further described below with reference to specific embodiments. The preferred embodiments of the present invention are described in detail below: Example 1

[0043] In this embodiment, see Figure 1 A method for rapid recording of a large field-of-view holographic volume view, the steps of which are as follows: (1) Sample the disparity map of the real scene or the virtual three-dimensional scene. The sampling angle range is twice the lens convergence angle. If the convergence angle is R°, then the sampling range is 2R°. The three-dimensional scene sampling yields multiple disparity map sequences, which are then divided into two groups according to the sampling angle; the first group consists of disparity maps with a sampling range of 0° to R°, and the second group consists of disparity maps with a sampling range of R° to 2R°. (2) Image preprocessing is performed on the two sets of disparity map sequences, specifically including: Extract one column of pixels from the image every other column to form a new disparity map. The number of pixel columns in the new disparity map is half that of the original disparity map. The preprocessing is performed cyclically on the two sets of disparity map sequences. (3) Sampling and encoding pixels or pixel blocks of the two preprocessed disparity maps to obtain holographic units for exposure; specifically including: Pixels at the same position in the disparity map are extracted and recombined to obtain a holographic unit sequence. This operation is repeated until all pixels in the disparity map are encoded. The holographic unit sequence extracted from the first set of disparity maps is the first set of holographic units, and the holographic unit sequence extracted from the second set of disparity maps is the second set of holographic units. (4) Adjust the beam angle deflector in the optical path to drive the mirror to rotate so that the reference light is incident at an angle R / 2°, which is half the angle of the converging lens in the horizontal and vertical directions. (5) Recording the first group of holographic units, specifically including: Preparation of ultra-high sensitivity holographic materials for rapid recording of large field-of-view holographic volume views; The first group of holographic units is sequentially loaded onto the display screen. The printing mechanism is controlled to perform scanning and exposure. The holographic units are closely arranged in the vertical direction and spaced apart by one column of holographic units in the horizontal direction. The position of the holographic units interferes with the reference light on the surface of the ultra-high sensitivity holographic recording material to record. (6) After the first group of holographic units completes recording, the high-precision rotating mechanism of the reflector in the control device rotates the reflector to a certain angle so that the reference light is incident at -R / 2°. (7) Scan and expose the second group of holographic units in sequence to fill the blank spaces between the exposure arrays of the first group of holographic units; complete the recording of the holographic volume view; (8) By post-processing the holographic material, a holographic volume view with a reconstructed field of view of twice the convergence angle 2R° is obtained.

[0044] The holographic recording method of this embodiment, which involves stitching together the reconstructed field of view, can achieve twice the reconstructed field of view compared to traditional methods, while also possessing high diffraction efficiency and recording efficiency.

[0045] Example 2: This embodiment is basically the same as Embodiment 1, except that: In this embodiment, steps (5) to (8) control the reference light to record the two sets of holographic units at different incident angles, specifically including: The reference light is positioned in the same plane as the horizontal rotation direction of the reconstructed image. The angle between the incident angle and the normal perpendicular to the holographic plate is controlled to be half the object light convergence angle, R / 2°. The first set of holographic units is recorded. When the first set of holographic units is recorded, the incident angle of the reference light is changed so that the reference light rotates in the same plane at the same angle R° as the object light convergence. At this time, the reference light forms an angle of -R / 2° with the vertical line of the holographic plate. The second set of holographic units is then recorded.

[0046] Alternatively, in steps (5) to (8), the platform movement mode is controlled, and the recording positions of the two sets of holographic units on the surface of the holographic recording material are set, specifically including: During the recording of the first set of holographic units, the XY electronically controlled two-dimensional moving platform moves twice the holographic printing width in the X direction and once the holographic unit length in the Y direction each time. This makes the holographic unit recording array such that the holographic units in the Y direction are closely connected and spaced apart by one column in the X direction. After completing the recording of the first set of holographic units, the platform is reset to the initial position and moves one step in the X direction, which is the starting position of the second set of holographic units. The exposure recording of the second set of holographic units is completed according to the same rule until the two sets of holographic unit arrays are recorded on the surface of the holographic material. In this case, every two columns of holographic units from the same set are separated by a column of holographic units from the other set.

[0047] Alternatively, in steps (5) to (8), during diffraction reconstruction, a group of holographic units has a diffraction range with the same convergence angle R°, the diffraction ranges of the two groups of holographic units are connected, and the holographic volume view composed of the two groups of holographic units with staggered intervals has a reconstruction field of view of 2R°, specifically including: In the holographic unit array recorded by the holographic recording material, the holographic units in adjacent columns are respectively from different groups of holographic unit sequences in the two sets of holographic unit sequences; when the two sets of holographic units are recorded, the angles of interference between their object light and reference light are different, differing by the same convergence angle R°; when reproducing the holographic volume view, the field of view of the first set of holographic units is R°, and the angle between its angle bisector and the normal to the vertical holographic plate is R / 2°, while the second set of units is reproduced from the other side, with a field of view of R°, and the angle between its angle bisector and the normal to the vertical holographic plate is also R / 2°; when the first set of holographic units leaves the diffraction range, it immediately enters the diffraction range of the second set of holographic units, and the field of view of the two sets of holographic units is connected, expanding the field of view to twice that of the traditional recording method.

[0048] In this embodiment, multiple disparity map sequences are obtained by sampling disparity maps from a 3D scene or a real scene; the disparity map sequences are divided into two groups, and image batch preprocessing is performed on the two groups of disparity map sequences respectively; the pixels of the two groups of preprocessed disparity maps are extracted and recombined in a cyclic manner to obtain two groups of holographic unit sequences.

[0049] Example 3: This embodiment is basically the same as the above embodiments, except that: In this embodiment, a large field-of-view holographic volume view rapid recording material is applied to the ultra-high sensitivity holographic material in the large field-of-view holographic volume view rapid recording method described in the above embodiment. The ultra-high sensitivity holographic material is a material doped with a small amount of calcium ions (Ca). 2+ Ions and doped formate ions HCO 2- Silver halide materials prepared by silver halide holographic emulsion; Ca ions are added during the precipitation stage of cubic AgBr emulsion preparation using a double-injection method, with the calcium doping concentration being 0.436%~0.87% of the silver ions; Ca(NO3)2·4H2O is used to avoid the influence of Cl ions on pAg; formate ions (HCO2) - As a "hole-electron converter", it is doped into silver halide with a doping concentration of 0.00001~0.0001 mol formate ions per mol of silver ions. The material has high photosensitivity.

[0050] In this embodiment, the first group of holographic units is recorded by interfering with the reference light scanning on an ultra-high sensitivity holographic material using a device. This can achieve twice the reconstruction field of view compared to the traditional method, while also having high diffraction efficiency and recording efficiency.

[0051] Example 4: This embodiment is basically the same as the above embodiments, except that: In this embodiment, the ultra-high sensitivity holographic material is a polymethyl methacrylate (PQ-PMMA) photopolymer material doped with graphene oxide (GO) and phenanthrenequinone (PQ). The monomer used in the PQ-PMMA photopolymer is methyl methacrylate (MMA), the photosensitizer is phenanthrenequinone (PQ), the thermal initiator is azobisisobutyronitrile (AIBN), and the material consists of a single layer of graphene oxide nanosheets. The composition is as follows: per 100 ml of water, 100 g of methyl methacrylate (MMA), 0.7 g-1 g of azobisisobutyronitrile (AIBN), 0.5-1.3 g of phenanthrenequinone (PQ), and 0.0005-0.002 g of graphene oxide (GO) are dissolved. Alternatively, the ultra-high sensitivity holographic material is dichromate gelatin (MBDCG) with an appropriate mass percentage concentration of 0.001%~0.01% methylene blue sensitizer, potassium dichromate sensitizer, and an appropriate amount of methylene (MB) dye as a sensitizer, and the organic reagent acrylamide as a pre-expansion agent. Alternatively, based on mass percentage concentration, the ultra-high sensitivity holographic material is a photorefractive polymer PMMA:DTNBI:C. 60 It is composed of polymethyl methacrylate (PMMA), 33%–40% of 1,3-dimethyl-2,2-tetramethylene-5-nitrobenzimidazolin (DTNBI), and 0.12%–0.32% C. 60 The polymer is composed of 2,4,7-trinitro-9-fluoroenone (TNF) and methyl phenyl C61-butyrate (PCBM) at a total mass of 0.01% to 0.03%. Alternatively, the ultra-high sensitivity holographic material is TrO2 nanoparticles modified with sodium citrate, incorporated at a mass percentage concentration of 0.112%~0.198% into a mixture of acrylamide (AA) and methylenebisacrylamide (BAA) as co-multifunctional monomers, phycoerythrone dye as a photosensitizer, triethanolamine (TEA) as a photoinitiator, and polyvinyl alcohol (PVA) as a binder. Alternatively, the ultra-high sensitivity holographic material is an iron-doped lithium niobate Er:Fe:LiNbO3 ferroelectric-photorefractive material, with an iron doping concentration of 0.112~0.138 mol of iron ions per liter of solution; and erbium (Er) is incorporated as an activator, with an erbium doping concentration of 0.0115~0.115 mol of erbium ions per liter of solution.

[0052] In this embodiment, the first group of holographic units is recorded by interfering with the reference light scanning on an ultra-high sensitivity holographic material using a device. This can achieve twice the reconstruction field of view compared to the traditional method, while also having high diffraction efficiency and recording efficiency.

[0053] Example 5: This embodiment is basically the same as the above embodiments, except that: In this embodiment, a large field-of-view holographic volume view rapid recording device is provided, which implements the large field-of-view holographic volume view rapid recording method described in the above embodiment. The device includes an optical path system, an electrically controlled beam angle deflector, a control system, and an integrated structure. The optical path system is used to synthesize red, green, and blue (RGB) laser light sources, carry holographic unit information, converge them onto the material surface, and record them by interference at different angles through coherent light; The beam angle deflector is used to drive the reflector to rotate at a set angle, and to reflect the incident beam in different directions before and after rotation. The control system is used for timing control of image loading, electronic shutter opening and closing, and XY two-dimensional moving platform movement, as well as for angle control of the beam angle deflector rotation and movement control of the movable rectangular aperture. The integrated structure is used to mount and fix the optical path system, the electronically controlled beam angle deflector, and the control system hardware and its wiring.

[0054] In this embodiment, the first set of holographic units is recorded by interfering with the reference light scanning on an ultra-high sensitivity holographic material using a device. After the recording of the first set of holographic units is completed, the beam angle deflector in the recording device is rotated by a certain angle so that the reference light is incident from the other side, and the second set of holographic units is scanned and recorded. The holographic recording method of the reconstruction field angle stitching in this embodiment can obtain twice the reconstruction field angle compared with the traditional method, while having high diffraction efficiency and recording efficiency.

[0055] Example 6: This embodiment is basically the same as the above embodiments, except that: In this embodiment, a method for rapid recording of a large field of view holographic volume view with twice the reconstruction field of view compared to traditional methods is provided. The method flowchart is as follows. Figure 1 The specific implementation steps of this invention will be described in detail below: Step 101: Sample the disparity map of the real scene or the virtual 3D scene to obtain multiple disparity map sequences, and divide the disparity map sequences into two groups according to the sampling angle.

[0056] The purpose of this step is to obtain a full-view disparity map of the 3D object. The method for obtaining the disparity map varies depending on the form in which the 3D object exists. Specifically, for 3D objects in real-world scenes, the disparity map can be obtained by taking photos of the 3D object from different angles using a real camera; for 3D objects rendered by 3D modeling software, the disparity map can be captured using the software's built-in virtual camera (such as 3ds Max, Autodesk 123D, etc.). Cameras can be used in an array or as motion cameras to capture multi-angle shots of the 3D scene in both horizontal and vertical directions.

[0057] There is no explicit requirement for the number of disparity images, but generally, the more samples taken, the smaller the angular intervals of the disparity images and the smaller the image structure changes, resulting in a smoother transition of the 3D scene when angles change after 3D reconstruction. Ultimately, multiple viewpoint images with a full view of the real scene should be obtained, and the disparity images should be arranged in a fixed path folder according to the shooting order.

[0058] The sampling angle of the disparity map is the angle of the converging lens. Let the lens convergence angle be R°, then the sampling range is 2R°. Step 102: Perform image preprocessing on the two sets of disparity map sequences.

[0059] This step preprocesses the disparity image obtained in step 101 by extracting a new disparity map from every other column of pixels. The number of pixel columns in the new disparity map is half that of the original image, effectively "narrowing" the image. This preprocessing is performed iteratively on the two sets of disparity map sequences.

[0060] Step 103: Sample and encode pixels or pixel blocks from the two preprocessed disparity maps to obtain a holographic unit sequence for exposure.

[0061] Step 103 specifically includes: 1) Sampling: For each disparity map in the disparity map sequence, extract pixels at the same position. Recombination: Obtain a holographic unit sequence. This operation is repeated until all pixels in the disparity map are involved in encoding.

[0062] 2) Encoding: Pixels extracted to the same position in different disparity maps are rearranged according to the disparity map sequence to obtain a holographic unit image. The pixel extraction and recombination operation is repeated until all pixels in the disparity map participate in encoding to obtain the holographic unit sequence used for exposure.

[0063] 3) Grouping: The holographic unit sequence extracted from the first group of disparity maps is the first group of holographic unit sequences, and the holographic unit sequence extracted from the second group of disparity maps is the second group of holographic unit sequences.

[0064] Step 104: Adjust the beam angle deflector in the optical path to rotate the reflector so that the reference light is directed at an angle where the horizontal and vertical directions converge at half the angle of the converging lens. See [link / reference] Figure 2 .

[0065] Step 105: Load the first group of holographic units onto the display screen in sequence, and scan and expose them by controlling the printing mechanism.

[0066] The XY two-dimensional moving platform is controlled to move words in a step size, causing the holographic units to be exposed on the surface of the holographic recording material. These holographic units are vertically closely aligned and horizontally spaced by a row of units. The position of these units interferes with the reference light on the surface of the holographic recording material, thus recording the image. (See [reference]). Figure 3 .

[0067] Step 106: After the first set of holographic units has completed recording, the high-precision rotation mechanism of the reflector inside the control device and the beam angle deflector drive the reflector to a certain angle, so that the angle between the reference beam and the reference beam during the first set of recordings is equal to the object beam convergence angle. See [link to relevant documentation]. Figure 2 .

[0068] Step 107: Scan and expose the second group of holographic units sequentially to fill the blank spaces between the exposure arrays of the first group of holographic units, thus completing the recording of the holographic volume view; This step involves making the object reference light angle during the recording of the second set of holographic unit sequences different from the object reference light angle during the recording of the first set of holographic unit sequences.

[0069] Step 108: By developing, fixing and bleaching the holographic material, a holographic volume view with a reconstructed field of view having twice the convergence angle is obtained.

[0070] Since the holographic unit array recorded by the holographic recording material contains holographic units in adjacent columns that originate from different sets of holographic unit sequences in the two sets of holographic unit sequences, see [link to documentation]. Figure 3 Different holographic unit sequences use different reference light interference angles. During diffraction reconstruction, when the first set of holographic units leaves the diffraction range, it immediately enters the diffraction range of the second set of holographic units. The reconstruction field of view of the two sets of holographic units is then connected, expanding the reconstruction field of view to twice that of the traditional recording method. See [link to documentation]. Figure 4 .

[0071] The present invention also provides a holographic volume view recording device for reproducing the stitched field of view, see [link to related document]. Figure 5 .

[0072] The device includes: 1 optical path system, 2 electrically controlled beam angle deflector, 3 control system, and 4 integrated structure.

[0073] The process of creating a holographic representation using the device specifically includes: The blue, green, and red laser light sources emitted by the 473nm blue laser (1-1), the 532nm green laser (1-2), and the 633nm red laser (1-3) are weakened by attenuators 1-4, 1-5, and 1-6. The light is then combined into a three-color light source by dichroic filters 1-7, 1-8, and 1-9 (half-reflective half-lens). After passing through the electronic shutter 2-1, the light enters the beam splitter prism 1-11 through the half-wave plate 1-10. The beam splitter splits the light into two beams: the transmitted beam is the reference beam, and the reflected beam is the object beam.

[0074] The object beam passes through the first polarizer (1-12) and enters the first beam expander (1-13) where it is amplified. After passing through the first collimating lens (1-14), the expanded beam is collimated into parallel light. The object beam, located on the first horizontal plane (3-1), is reflected by the reflecting mirror (1-15) into the first vertical plane (3-2) and illuminates the scattering film (1-16). The scattering film is in close contact with the display screen (2-2), and the beam is homogenized and passes through the display screen. At this time, the object beam carries the image information of the holographic unit loaded on the display screen. The object beam enters the 4f system (1-17) composed of Fourier lenses with different focal lengths and a small aperture at the focal point of the first Fourier lens. It then enters the converging objective lens (1-18), passes through the rectangular aperture (1-19), and finally converges onto the surface of the holographic material (1-20) fixed on the electronically controlled two-dimensional moving platform (2-5).

[0075] The reference beam passes through the second polarizer (1-20) and enters the second beam expander (1-21) where it is expanded and magnified. After passing through the second collimating lens (1-22), the expanded beam is collimated into parallel light. After being reflected by the first reflecting mirror (1-23), the light path direction is changed. After being reflected by the second reflecting mirror (1-24), the reference light on the first horizontal plane (3-1) is reflected into the first vertical plane (3-2). After being reflected by the third reflecting mirror (1-25) fixed on the beam angle deflector (2-3), it is reflected to the fourth reflecting mirror (1-26). By moving the rectangular aperture (2-4), it forms a certain angle with the object beam and interferes with the surface of the holographic material (1-20).

[0076] When the first holographic unit image of the first group is loaded onto the display screen 2-2, the shutter 2-1 is opened for exposure. Then, the moving platform 2-5 is moved one holographic unit distance, the display screen 2-2 loads the second holographic unit image of the first group, and the shutter 2-1 is opened again for exposure. This cycle repeats until the first holographic unit sequence has completed exposure recording.

[0077] Control the beam angle deflector 2-3 to drive the third reflector 1-25 to rotate by a set angle, change the direction of the reference light reflection, and illuminate the fifth reflector 1-27. Control the movable rectangular aperture 2-4 to move a set distance so that the reference light passes through the movable rectangular aperture 2-4 and overlaps with the object light spot on the surface of the holographic material 1-20.

[0078] Control the two-dimensional platform 2-5 to reset to the initial position, and move the platform in the X direction by one step, which is the starting position of the second group of holographic units. Expose the image sequence of the second group of holographic units, and the process is similar to recording the sequence of the first group of holographic units.

[0079] Compared with related technologies, the present invention has the following advantages: It achieves twice the field of view of traditional recording methods, and can clearly display twice the perspective information of three-dimensional objects on the same holographic volume view, providing a better three-dimensional visual experience.

[0080] With high economic benefits and strong adaptability, it does not actually require special optical components. Simply adding a mirror to the optical components can double the field of view.

[0081] The recording is completed automatically, and the holographic volume view production process requires no human intervention. It realizes the timing control of shutter control, image loading, platform movement, and reference light position switching.

[0082] The above embodiments sample disparity maps of 3D or real-world scenes to obtain multiple disparity map sequences. These sequences are divided into two groups, and batch image preprocessing is performed on each group. Pixel cyclic extraction and recombination are then performed on the preprocessed disparity maps to obtain two sets of holographic unit sequences. The first set of holographic units is recorded by interfering with a reference light scan on an ultra-high sensitivity holographic material. After recording the first set of holographic units, the beam angle deflector in the recording device is rotated by a certain angle, causing the reference light to be incident from the other side, to scan and record the second set of holographic units. Compared with related technologies, this invention's holographic recording method, which stitches together the reconstructed field of view, can achieve twice the reconstructed field of view compared to traditional methods, while also possessing high diffraction and recording efficiency.

[0083] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The systems disclosed in the above embodiments are described simply because they correspond to the methods disclosed in the embodiments; relevant parts can be found in the method section.

[0084] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made according to the purpose of the invention. Any changes, modifications, substitutions, combinations or simplifications made based on the spirit and principle of the technical solution of the present invention shall be equivalent substitutions. As long as they meet the purpose of the invention and do not deviate from the technical principle and inventive concept of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A method for rapid recording of a large field-of-view holographic volume view, characterized in that: The steps are as follows: (1) Sample the disparity map of the real scene or the virtual three-dimensional scene. The sampling angle range is twice the lens convergence angle. If the convergence angle is R°, then the sampling range is 2R°. The three-dimensional scene sampling yields multiple disparity map sequences, which are then divided into two groups according to the sampling angle; the first group of disparity maps has a sampling range of 0° to R°, and the second group has a sampling range of R° to 2R°. (2) Image preprocessing is performed on the two sets of disparity map sequences, specifically including: Extract one column of pixels from the image every other column to form a new disparity map. The number of pixel columns in the new disparity map is half that of the original disparity map. The preprocessing is performed cyclically on the two sets of disparity map sequences. (3) Sampling and encoding pixels or pixel blocks of the two preprocessed disparity maps to obtain holographic units for exposure; specifically including: Pixels at the same position in the disparity map are extracted and recombined to obtain a holographic unit sequence. This operation is repeated until all pixels in the disparity map are encoded. The holographic unit sequence extracted from the first set of disparity maps is the first set of holographic units, and the holographic unit sequence extracted from the second set of disparity maps is the second set of holographic units. (4) Adjust the beam angle deflector in the optical path to drive the mirror to rotate so that the reference light is incident at an angle R / 2°, which is half the angle of the converging lens in the horizontal and vertical directions. (5) Recording the first group of holographic units, specifically including: Preparation of ultra-high sensitivity holographic recording materials for rapid recording of large field-of-view holographic volume views; The first group of holographic units is sequentially loaded onto the display screen. The printing mechanism is controlled to perform scanning and exposure. The holographic units are closely arranged in the vertical direction and spaced apart by one column of holographic units in the horizontal direction. The position of the holographic units interferes with the reference light on the surface of the ultra-high sensitivity holographic recording material to record. (6) After the first group of holographic units completes recording, the high-precision rotating mechanism of the reflector in the control device rotates the reflector to a certain angle so that the reference light is incident at -R / 2°. (7) Scan and expose the second group of holographic units in sequence to fill the blank spaces between the exposure arrays of the first group of holographic units; complete the recording of the holographic volume view; (8) By post-processing the ultra-high sensitivity holographic recording material, a holographic volume view with a reconstruction field of view of twice the convergence angle 2R° is obtained.

2. The method for rapid recording of a large field-of-view holographic volume view according to claim 1, characterized in that: Steps (5) to (8) involve controlling the reference light at different incident angles to record the two sets of holographic units, specifically including: The reference light is positioned in the same plane as the horizontal rotation direction of the reconstructed image. The angle between the incident angle and the normal perpendicular to the holographic plate is controlled to be half the object light convergence angle, R / 2°. The first set of holographic units is recorded. When the first set of holographic units is recorded, the incident angle of the reference light is changed so that the reference light rotates in the same plane at the same angle R° as the object light convergence. At this time, the reference light forms an angle of -R / 2° with the vertical line of the holographic plate. The second set of holographic units is then recorded.

3. The method for rapid recording of a large field-of-view holographic volume view according to claim 2, characterized in that: In steps (5) to (8), the movement mode of the control platform is controlled, and the recording positions of the two sets of holographic units on the surface of the ultra-high sensitivity holographic recording material are set, specifically including: During the recording of the first set of holographic units, the XY electronically controlled two-dimensional moving platform moves twice the holographic printing width in the X direction and once the holographic unit length in the Y direction each time. This makes the holographic unit recording array such that the holographic units in the Y direction are closely connected and spaced apart by one column of holographic units in the X direction. After completing the recording of the first set of holographic units, the platform is reset to the initial position and moves one step in the X direction, which is the starting position of the second set of holographic units. The exposure recording of the second set of holographic units is completed according to the same rule until the two sets of holographic unit arrays are recorded on the surface of the ultra-high sensitivity holographic recording material. In this case, every two columns of holographic units from the same set are separated by a column of holographic units from the other set.

4. The method for rapid recording of a large field-of-view holographic volume view according to claim 3, characterized in that: In steps (5) to (8), during diffraction reconstruction, a set of holographic units has a diffraction range with the same convergence angle R°, the diffraction ranges of the two sets of holographic units are connected, and the holographic volume view composed of the two sets of holographic units with staggered intervals has a reconstruction field of view of 2R°, specifically including: In the holographic unit array recorded by the ultra-high sensitivity holographic recording material, the holographic units in adjacent columns are respectively from different groups of holographic unit sequences in the two sets of holographic unit sequences; when the two sets of holographic units are recorded, the angles of interference between their object light and reference light are different, differing by the same convergence angle R°; when reproducing the holographic volume view, the field of view of the first set of holographic units is R°, and the angle between its angle bisector and the normal to the vertical holographic plate is R / 2°, while the second set of units is reproduced from the other side, with a field of view of R°, and the angle between its angle bisector and the normal to the vertical holographic plate is also R / 2°; when the first set of holographic units leaves the diffraction range, it immediately enters the diffraction range of the second set of holographic units, and the field of view of the two sets of holographic units is connected, expanding the field of view to twice that of the traditional recording method.

5. A large field-of-view holographic volume view rapid recording material, used in the large field-of-view holographic volume view rapid recording method of claim 1, characterized in that: The ultra-high sensitivity holographic recording material is doped with a small amount of calcium ions (Ca). 2+ Ions and doped formate ions HCO2 - Silver halide materials prepared by silver halide holographic emulsion; Ca ions are added during the precipitation stage of cubic AgBr emulsion preparation using a double-injection method, with the calcium doping concentration being 0.436%~0.87% of the silver ions; Ca(NO3)2·4H2O is used to avoid the influence of Cl ions on pAg; formate ions HCO2 - As a "hole-electron converter" doped into silver halides, the doping concentration is 0.00001~0.0001 mol formate ions per mol of silver ions. The material has high photosensitivity.

6. The large field-of-view holographic volume view rapid recording material according to claim 5, characterized in that: The ultra-high sensitivity holographic recording material is a graphene oxide (GO) and phenanthrenequinone (PQ)-doped polymethyl methacrylate (PQ-PMMA) photopolymer material. The monomer used in the phenanthrenequinone (PQ)-doped polymethyl methacrylate (PQ-PMMA) photopolymer material is methyl methacrylate (MMA), the photosensitizer is phenanthrenequinone (PQ), the thermal initiator is azobisisobutyronitrile (AIBN), and the material consists of a single layer of graphene oxide nanosheets. In each 100 ml of water, 100 g of methyl methacrylate (MMA), 0.7 g-1 g of azobisisobutyronitrile (AIBN), 0.5 g-1.3 g of phenanthrenequinone (PQ), and 0.0005-0.002 g of graphene oxide (GO) are dissolved. Alternatively, the ultra-high sensitivity holographic recording material is dichromate gelatin (MBDCG) with an appropriate mass percentage concentration of 0.001%~0.01% methylene blue sensitizer, potassium dichromate sensitizer, and an appropriate amount of methylene (MB) dye as a sensitizer, and the organic reagent acrylamide as a pre-expansion agent. Alternatively, based on mass percentage concentration, the ultra-high sensitivity holographic recording material is a photorefractive polymer PMMA:DTNBI:C. 60 It is composed of polymethyl methacrylate (PMMA), 33%–40% of 1,3-dimethyl-2,2-tetramethylene-5-nitrobenzimidazolin (DTNBI), and 0.12%–0.32% C. 60 The polymer is composed of 2,4,7-trinitro-9-fluoroenone (TNF) and methyl phenyl C61-butyrate (PCBM) at a total mass of 0.01% to 0.03%. Alternatively, the ultra-high sensitivity holographic recording material is TrO2 nanoparticles modified with sodium citrate, incorporated at a mass percentage concentration of 0.112%~0.198% into a mixture of acrylamide (AA) and methylenebisacrylamide (BAA) as co-multifunctional monomers, phycoerythrone dye as a photosensitizer, triethanolamine (TEA) as a photoinitiator, and polyvinyl alcohol (PVA) as a binder. Alternatively, the ultra-high sensitivity holographic recording material is an iron-doped lithium niobate Er:Fe:LiNbO3 ferroelectric-photorefractive material, with an iron doping concentration of 0.11 mol² to 0.138 mol iron ions per liter of solution; and erbium (Er) is incorporated as an activator, with an erbium doping concentration of 0.0115 mol to 0.115 mol erbium ions per liter of solution.

7. A device for rapid recording of large field-of-view holographic volume views, implementing the rapid recording method for large field-of-view holographic volume views as described in claim 1, characterized in that: The device includes an optical path system, an electronically controlled beam angle deflector, a control system, and an integrated structure. The optical path system is used to synthesize red, green, and blue (RGB) laser light sources, carry holographic unit information, and converge them onto the surface of an ultra-high sensitivity holographic recording material, and record them by interference at different angles through coherent light; The beam angle deflector is used to drive the reflector to rotate at a set angle, and to reflect the incident beam in different directions before and after rotation. The control system is used for timing control of image loading, electronic shutter opening and closing, and XY two-dimensional moving platform movement, as well as for angle control of the beam angle deflector rotation and movement control of the moving rectangular aperture. The integrated structure is used to mount and fix the optical path system, the electronically controlled beam angle deflector, and the control system hardware and its wiring.

Images