A polarization holographic multiplexing system and method based on orthogonal polarization matrix

Abstract

The application relates to a polarization holographic multiplexing system and method based on an orthogonal polarization matrix, which comprises a laser light source for generating laser light, a first polarization beam splitter for splitting the laser light passing through an optical diaphragm into signal light and reference light, a reference light splitting module for splitting the reference light into m beams of reference light, a polarization state adjusting module comprising m half-wave plates, a combiner for non-overlapping parallel combination of the m beams of reference light, a spatial light modulator for modulating the signal light, and a polarization-sensitive material for recording the interference between the signal light and the reference light. Since the dimension of the multi-dimensional orthogonal polarization matrix can be wirelessly widened, the hologram multiplexing of any channel number can be realized, and the multiplexing capacity of the multi-channel hologram is greatly enhanced, which shows great potential in the aspect of multiplexing capacity.

Description

Technical Field

[0001] This application relates to the fields of polarized holography and multiplexing technology, specifically to a polarized holographic multiplexing system and method based on orthogonal polarization matrices. Background Technology

[0002] Volume holographic memory is considered a potential next-generation data storage technology due to its high storage density and fast transmission rate. To further improve the holographic storage capacity of volume holographic memory, various multiplexing methods have been proposed. Traditional multiplexing methods include angle multiplexing, wavelength multiplexing, shift multiplexing, and phase multiplexing. With the continuous advancement of polarized holography research, polarization multiplexing technology has emerged, which utilizes the polarization sensitivity of polarized volume holograms to achieve polarization-selective multiplexing.

[0003] Polarized holography has attracted considerable attention due to its ability to simultaneously record and retrieve the amplitude, phase, and polarization of light waves in polarization-sensitive recording materials, such as PQ / PMMA. Several polarization multiplexing methods have been proposed. However, these methods have an upper limit on the number of multiplexing points at a single point, with a maximum of four. Furthermore, a multiplexing of four does not mean truly retrieving four images individually; rather, it requires orthogonal separation of the reconstructed light under orthogonal reference light reconstruction to indirectly retrieve the recorded information. However, exploration of multichannel multiplexing using polarization modulation techniques has not been widely conducted. This lack of research and development in this field hinders the maximization of information storage capacity in polarized holography and limits the versatility of this technology.

[0004] To expand the polarization multiplexing capacity of polarization holography, a polarization-modulated orthogonal matrix is ​​needed. However, there is currently no orthogonal matrix with polarization dimension, which hinders the application of polarization modulation and limits the use of polarization holography to achieve multi-channel multiplexing in the polarization dimension. Summary of the Invention

[0005] In view of the above problems, this application provides a polarization holographic multiplexing system and method based on orthogonal polarization matrices, which solves the problem that existing orthogonal matrices without polarization dimensions limit the realization of multi-channel multiplexing in the polarization dimension using polarization holography.

[0006] To achieve the above objectives, the inventors provide a polarized holographic multiplexing system based on an orthogonal polarization matrix, comprising:

[0007] A laser source, used to generate laser light;

[0008] An aperture, wherein the aperture is disposed in the optical path of the laser;

[0009] A first polarization beam splitter is disposed in the optical path of the laser beam, and the first polarization beam splitter is used to split the laser beam passing through the aperture into signal light and reference light.

[0010] A reference beam splitting module is disposed on the optical path of the reference light obtained by the first polarization beam splitter. The reference beam splitting module is used to split the reference light obtained by the first polarization beam splitter into m reference beams, where m is 2 to the power of k and k is 1, 2, 3, ...

[0011] A polarization state adjustment module, comprising m half-wave plates, which are respectively disposed on the optical paths of the m reference beams obtained by the reference beam splitting module. The half-wave plates are used to adjust the polarization state of the corresponding reference beams.

[0012] A beam combiner is used to perform non-overlapping parallel beam combining of m reference beams obtained by the reference beam splitting module; a spatial light modulator is disposed in the optical path of the signal light and is used to modulate the signal light.

[0013] A polarization-sensitive material is disposed at the interference point between the reference light and the signal light, and the polarization-sensitive material is used to record the interference between the signal light and the reference light.

[0014] In some embodiments, a beam expander is further included, which is disposed between the laser source and the rectangular aperture, and is used to expand the laser beam generated by the laser source.

[0015] In some embodiments, the beam expander includes a spatial filter and a beam expanding lens;

[0016] The spatial filter is disposed between the laser source and the beam expander, and the spatial filter is used to filter the laser light generated by the laser source.

[0017] In some embodiments, the aperture is a rectangular aperture.

[0018] In some embodiments, the laser source is a fundamental mode TEM with a wavelength of 532 nm. 00 Green laser.

[0019] In some embodiments, the beam combiner is a beam splitter.

[0020] In some embodiments, the spatial light modulator is an amplitude-type spatial light modulator.

[0021] In some embodiments, an image acquisition and detection unit is further included, which is used to capture the reproduced image recorded by the polarization-sensitive material.

[0022] Another technical solution is also provided: a polarization holographic multiplexing method based on orthogonal polarization matrices. This method is based on the aforementioned polarization holographic multiplexing system based on orthogonal polarization matrices, and includes the following steps:

[0023] Laser light sources generate laser light;

[0024] After passing through the aperture, the laser beam is split into signal light and reference light by the first polarization beam splitter.

[0025] The reference light obtained by the first polarization beam splitter is split into m reference lights by the reference light beam splitting module.

[0026] The polarization state of the m-path reference light obtained by the reference light beam splitting module is adjusted according to the orthogonal polarization matrix column;

[0027] The m-path reference beams obtained by the polarization-adjusted reference beam splitting module are non-overlapping parallel beams combined using a beam combiner.

[0028] The signal light is modulated using a spatial light modulator;

[0029] The interference between the combined reference light and the modulated signal light is recorded using a polarization-sensitive material.

[0030] In some embodiments, the following steps are also included:

[0031] The image acquisition and detection unit captures the reproduced image of the polarization-sensitive material.

[0032] Unlike existing technologies, the above technical solution involves a laser source generating laser light, which is then limited by an aperture and split into signal light and reference light by a first polarization beam splitter. A reference light beam splitting module further splits the reference light from the first polarization beam splitter into m reference beams. Then, based on an orthogonal polarization matrix, m half-wave plates in a polarization state adjustment module adjust the polarization states of the m reference beams obtained from the reference light beam splitting module, ensuring that the polarization states of the m reference beams obtained from the reference light beam splitting module are orthogonal to the polarization matrix. A beam combiner then performs non-overlapping parallel beam combining of the m reference beams obtained from the polarization state-adjusted reference light beam splitting module. Simultaneously, a spatial light modulator modulates the signal light. Finally, a polarization-sensitive material records the interference between the combined reference light and the modulated signal light. This method utilizes polarization holography to modulate the polarization state combination of the reference light using a multi-dimensional orthogonal polarization matrix and records and reconstructs multiple images individually using a polarization-sensitive material. Since the dimensions of a multidimensional orthogonal polarization matrix can be infinitely expanded, it can realize the reuse of holograms with any number of channels, showing great potential in significantly enhancing the reuse capability of multi-channel holograms.

[0033] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0034] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0035] In the accompanying drawings of the instruction manual:

[0036] Figure 1 This is a schematic diagram of a polarized holographic multiplexing system based on orthogonal polarization matrices as described in a specific implementation.

[0037] Figure 2 This is a schematic diagram of another structure of the polarized holographic multiplexing system based on orthogonal polarization matrices described in the specific implementation;

[0038] Figure 3 This is a schematic diagram of another structure of the polarized holographic multiplexing system based on orthogonal polarization matrices described in the specific implementation;

[0039] Figure 4 This is a schematic diagram of another structure of the polarized holographic multiplexing system based on orthogonal polarization matrices described in the specific implementation;

[0040] Figure 5 This is a schematic flowchart of a polarization holographic multiplexing method based on orthogonal polarization matrices, as described in a specific implementation.

[0041] The reference numerals used in the above figures are explained as follows:

[0042] 1. Laser light source,

[0043] 2. Aperture;

[0044] 3. First polarization beam splitter;

[0045] 4. Second polarization beam splitter;

[0046] 5. First half-wave plate,

[0047] 6. Second half-wave plate,

[0048] 7. Bundle combiner,

[0049] 8. Spatial light modulator,

[0050] 9. Polarization-sensitive materials

[0051] 10. Spatial filter

[0052] 11. Beam expander lens

[0053] 12. Imaging system

[0054] 13. Detector

[0055] 14. Third half-wave plate,

[0056] 15. The fourth half-wave plate. Detailed Implementation

[0057] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0058] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0059] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0060] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0061] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0062] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0063] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0064] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] By combining the linearly polarized state s (polarization direction perpendicular to the incident plane) with orthogonal polarization characteristics and the p-polarized light, a vector with two rows and one column is formed: (s, p). T Using s and p as coordinate axes, we can find the following three pairs of vectors that form a pairwise orthogonal vector: (s, -p).T (p,s) T (p,-s) T T represents the transpose relation. These four sets of vectors together form a matrix, called O1. 2×4 And satisfying O 2×4 T O 2×4 =E 4×4 Therefore, O 2×4 This is the minimum-dimensional orthogonal polarization matrix. Multidimensional orthogonal polarization matrix O 2n×4n It can be derived from the Hadamard matrix H n×n Constructed from:

[0067] in It is a recursive Kronecker product.

[0068] Using the column vectors of the orthogonal polarization matrix mentioned above as reference light, multi-channel polarization multiplexing can be achieved. For example, using O... 2n×4n It can achieve 4n-channel polarization multiplexing. Specifically, a polarization holographic multiplexing system based on orthogonal polarization matrices for 4n-channel polarization multiplexing includes:

[0069] A laser source, used to generate laser light;

[0070] An aperture, wherein the aperture is disposed in the optical path of the laser;

[0071] A first polarization beam splitter is disposed in the optical path of the laser beam. The first polarization beam splitter is used to split the laser beam passing through the rectangular aperture into signal light and reference light.

[0072] A reference beam splitter module is disposed on the optical path of the reference light obtained by the first polarization beam splitter. The reference beam splitter module is used to split the reference light obtained by the first polarization beam splitter into m reference beams, where m is 2 to the power of k and k is 1, 2, 3, ...; wherein, polarization multiplexing of 4n channels is realized, m = 2n, that is, the reference light obtained by the first polarization beam splitter is split into 2n reference beams;

[0073] A polarization state adjustment module, comprising m half-wave plates, which are respectively disposed on the optical paths of the m reference beams obtained by the reference beam splitting module. The half-wave plates are used to adjust the polarization state of the corresponding reference beams.

[0074] A beam combiner is used to perform non-overlapping parallel beam combining of m reference beams obtained by the reference beam splitting module; a spatial light modulator is disposed in the optical path of the signal light and is used to modulate the signal light.

[0075] A polarization-sensitive material is disposed at the interference point between the reference light and the signal light, and the polarization-sensitive material is used to record the interference between the signal light and the reference light.

[0076] A laser source generates laser light, which is then limited by an aperture and split into signal light and reference light by a first polarization beam splitter. A reference light beam splitting module further splits the reference light from the first polarization beam splitter into m reference beams. Then, based on an orthogonal polarization matrix, the polarization states of the m reference beams obtained from the reference light beam splitting module are adjusted by m half-wave plates in a polarization state adjustment module, ensuring that the polarization states of the m reference beams obtained from the reference light beam splitting module are orthogonal to the polarization matrix. A beam combiner then performs non-overlapping parallel beam combining of the m reference beams obtained from the polarization state adjustment module. Simultaneously, a spatial light modulator modulates the signal light. Finally, a polarization-sensitive material records the interference between the combined reference light and the modulated signal light. This method utilizes polarization holography to modulate the polarization state combination of the reference light using a multi-dimensional orthogonal polarization matrix, and records and reconstructs multiple images individually using a polarization-sensitive material. Because the dimensions of a multidimensional orthogonal polarization matrix can be infinitely expanded, hologram multiplexing with any number of channels can be achieved, demonstrating great potential in significantly enhancing the multiplexing capability of multi-channel holograms. For an example of 4-channel multiplexing, please refer to [link to relevant documentation]. Figure 1 This embodiment provides a polarized holographic multiplexing system based on an orthogonal polarization matrix, wherein the orthogonal polarization matrix is ​​O 2×4 The system includes:

[0077] Laser source 1, the laser source 1 being used to generate laser light;

[0078] Aperture 2 is disposed in the optical path of the laser; preferably, aperture 2 is a rectangular aperture.

[0079] The first polarization beam splitter 3 is disposed in the optical path of the laser beam and is used to split the laser beam passing through the rectangular aperture into signal light and reference light.

[0080] The reference beam splitter module includes a second polarization beam splitter 4, which is disposed in the optical path of the reference beam and is used to split the reference beam into a first reference beam and a second reference beam.

[0081] The polarization state adjustment module includes a first half-wave plate 5 and a second half-wave plate 6. The first half-wave plate 5 is disposed in the optical path of the first reference light and is used to adjust the polarization state of the first reference light.

[0082] The second half-wave plate 6 is disposed in the optical path of the second reference light, and the second half-wave plate 6 is used to adjust the polarization state of the second reference light;

[0083] A beam combiner 7 is disposed at the intersection between the optical paths of the first reference light and the second reference light, and the beam combiner 7 is used to perform non-overlapping parallel beam combining of the first reference light and the second reference light.

[0084] A spatial light modulator 8 is disposed in the optical path of the signal light and is used to modulate the signal light.

[0085] A polarization-sensitive material 9 is disposed at the interference point between the reference light and the signal light, and the polarization-sensitive material 9 is used to record the interference between the signal light and the reference light.

[0086] A laser source generates laser light, which is then confined by a rectangular aperture and split into signal light and reference light by a first polarization beam splitter. A second polarization beam splitter further splits the reference light into first and second reference lights. Based on an orthogonal polarization matrix, the polarization state of the first reference light is adjusted by a first half-wave plate, and the polarization state of the second reference light is adjusted by a second half-wave plate, ensuring that the polarization states of the first and second reference lights are orthogonal to the polarization matrix. A beam combiner then performs non-overlapping parallel beam combining of the polarization-adjusted first and second reference lights. This non-overlapping parallel beam combining allows for vector superposition of the reconstructed light from each component, resulting in an effect equivalent to the inner product of two vectors. The product of corresponding positions of the reference light represents the reconstructed light from that component, and the sum of the reconstructed light from each component is equivalent to the inner product. Simultaneously, a spatial light modulator modulates the signal light. Finally, a polarization-sensitive material records the interference between the combined reference light and the modulated signal light. By using polarized holography, the polarization state combination of reference light is modulated using a multidimensional orthogonal polarization matrix, and multiple images are recorded and reconstructed individually using polarization-sensitive materials. Since the dimensions of the multidimensional orthogonal polarization matrix can be infinitely expanded, holograms with any number of channels can be reused, demonstrating great potential in significantly enhancing the multiplexing capability of multi-channel holograms.

[0087] In this embodiment, a polarization holographic multiplexing system based on orthogonal polarization matrices is presented. This system provides a method for constructing a multidimensional orthogonal polarization matrix composed of polarization combinations, and uses this matrix to achieve multi-channel polarization multiplexing in polarization holography. The method employs a polarization-sensitive material, such as PQ / PMMA, as the recording medium. Reference lights composed of column vectors from the orthogonal polarization matrix are used to record p-polarized signal light (with its polarization direction parallel to the incident plane) carrying different desired information multiple times at a 90° interference angle. During reconstruction, when different readout reference lights, still composed of column vectors from the orthogonal polarization matrix, illuminate the recording medium, the recorded information with different p-polarization states can be reconstructed individually, thus achieving the recording and reconstruction of multi-channel holograms.

[0088] Please see Figure 2-4 In some embodiments, a beam expander is further included, disposed between the laser source and the rectangular aperture, for expanding the laser beam generated by the laser source. A laser source with a large output laser diameter can be used to generate the laser. When a laser source with a small output laser diameter is used, a beam expander is placed between the laser source and the rectangular aperture to expand the laser beam generated by the laser source. The beam expander includes a spatial filter 10 and a beam-expanding lens 11. The spatial filter 10 is disposed between the laser source 1 and the beam-expanding lens 11, and is used to filter the laser beam generated by the laser source. Filtering the laser beam generated by the laser source using the spatial filter 10 removes wavefront distortion caused by dust adhering to the laser source or by reflective surfaces, resulting in a more ideal spherical wave.

[0089] In some embodiments, the laser source is a fundamental mode TEM with a wavelength of 532 nm. 00 Green laser.

[0090] In some embodiments, the beam combiner is a beam splitter. A beam splitter can not only split a light beam, but also combine two light beams. A beam splitter can perform non-overlapping parallel beam combining of a first reference beam and a second reference beam.

[0091] In some embodiments, the spatial light modulator 8 is an amplitude-type spatial light modulator. The amplitude information of the signal light is modulated using an amplitude-type spatial light modulator. In other embodiments, the spatial light modulator 8 can also be a phase-type spatial light modulator. When a phase-type spatial light modulator is used, the signal light must be p-polarized in the optical path. The conditions for multi-channel multiplexing are only met when p-polarized light is used as the signal light and the interference angle between the signal light and the reference light is 90°.

[0092] Please see Figure 3-4In some embodiments, an image acquisition and detection unit is also included, which is used to capture the reproduced image recorded by the polarization-sensitive material.

[0093] The image acquisition and detection unit can capture the reproduced image of polarization-sensitive materials. The image acquisition module consists of an imaging system 12 and a detector 13. The imaging system 12 consists of two lenses, and the detector 13 is a CCD detector.

[0094] In this embodiment, the polarization-sensitive material is a PQ / PMMA material made of phenanthrenequinone (PQ), 2,2-azobisisobutyronitrile (AIBN), and methyl methacrylate (MMA).

[0095] Please see Figure 4 In some embodiments, a third half-wave plate 14 is provided between the beam expander and the first polarizing beam splitter 3, and a fourth half-wave plate 15 is provided between the first polarizing beam splitter 3 and the second polarizing beam splitter 4. The intensity ratio of the two beams obtained by splitting the beams through the first polarizing beam splitter 3 is adjusted by the third half-wave plate 14, and the intensity ratio of the two beams obtained by splitting the beams through the second polarizing beam splitter 4 is adjusted by the fourth half-wave plate 15.

[0096] Please see Figure 5 In another embodiment, a polarization holographic multiplexing method based on orthogonal polarization matrices is provided. The method is based on the aforementioned polarization holographic multiplexing system based on orthogonal polarization matrices, and includes the following steps:

[0097] Step S510: The laser source generates laser light;

[0098] Step S520: After passing through the aperture, the laser beam is split into signal light and reference light by the first polarization beam splitter;

[0099] Step S530: The reference light obtained by the first polarization beam splitter is split into m reference beams by the reference light beam splitting module;

[0100] Step S540: Adjust the polarization state of the m-path reference light obtained by the reference light beam splitting module according to the orthogonal polarization matrix column;

[0101] Step S550: The m-path reference beams obtained by the polarization-adjusted reference beam splitting module are non-overlapping parallel beams combined using a beam combiner.

[0102] Step S560: Modulate the signal light using a spatial light modulator;

[0103] Step S570: Record the interference between the combined reference light and the modulated signal light using a polarization-sensitive material. A laser source generates laser light, which, after being limited by an aperture, is split into signal light and reference light by a first polarization beam splitter. The reference light obtained from the first polarization beam splitter is then split into m reference beams by a reference light beam splitting module. Then, based on the orthogonal polarization matrix, the polarization states of the m reference beams obtained by the reference light beam splitting module are adjusted by m half-wave plates in the polarization state adjustment module, ensuring that the polarization states of the m reference beams obtained by the reference light beam splitting module are orthogonal to the polarization matrix. A beam combiner then performs non-overlapping parallel beam combining of the m reference beams obtained by the polarization state-adjusted reference light beam splitting module. Simultaneously, a spatial light modulator modulates the signal light. Finally, the interference between the combined reference light and the modulated signal light is recorded using a polarization-sensitive material. This method utilizes polarization holography to modulate the polarization state combination of the reference light using a multi-dimensional orthogonal polarization matrix, and records and reconstructs multiple images individually using a polarization-sensitive material. Since the dimensions of a multidimensional orthogonal polarization matrix can be infinitely expanded, it can realize the reuse of holograms with any number of channels, showing great potential in significantly enhancing the reuse capability of multi-channel holograms.

[0104] This embodiment provides a method for constructing a multidimensional orthogonal polarization matrix composed of polarization combinations, and uses it to achieve polarization multichannel multiplexing in polarized holography. The method employs a polarization-sensitive material, such as PQ / PMMA, as the recording medium. Reference lights composed of column vectors from the orthogonal polarization matrix are used to record p-polarized signal light (polarization direction parallel to the incident plane) carrying different desired information multiple times at a 90° interference angle. During reconstruction, when different readout reference lights, still composed of column vectors from the orthogonal polarization matrix, illuminate the recording medium, the recorded information with different p-polarization states can be reconstructed individually, thereby achieving the recording and reconstruction of a multichannel hologram.

[0105] By combining the linearly polarized state s (polarization direction perpendicular to the incident plane) with orthogonal polarization characteristics and the p-polarized light, a vector with two rows and one column is formed: (s, p). T Using s and p as coordinate axes, we can find the following three pairs of vectors that form a pairwise orthogonal vector: (s, -p). T (p,s) T (p,-s) T T represents the transpose relation. These four sets of vectors together form a matrix, called O1. 2×4 And satisfying O 2×4 T O 2×4 =E 4×4 Therefore, O 2×4 This is the minimum-dimensional orthogonal polarization matrix. Multidimensional orthogonal polarization matrix O2n×4n It can be derived from the Hadamard matrix H n×n Constructed from:

[0106]

[0107] in It is a recursive Kronecker product.

[0108] Using the column vectors of the orthogonal polarization matrix mentioned above as reference light, multi-channel polarization multiplexing can be achieved. For example, using O... 2n×4n It can achieve polarization multiplexing of 4n channels.

[0109] In some embodiments, the following steps are also included:

[0110] The image acquisition and detection unit captures the reproduced image of the polarization-sensitive material.

[0111] The image acquisition and detection unit can capture the reproduced images recorded on polarization-sensitive materials. The image acquisition module consists of an imaging system and a detector. The imaging system comprises two lenses, and the detector is a CCD detector.

[0112] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A polarized holographic multiplexing system based on an orthogonal polarization matrix, characterized in that, include: A laser source, used to generate laser light; An aperture, wherein the aperture is disposed in the optical path of the laser; A first polarization beam splitter is disposed in the optical path of the laser beam, and the first polarization beam splitter is used to split the laser beam passing through the aperture into signal light and reference light. A reference beam splitting module is disposed on the optical path of the reference light obtained by the first polarization beam splitter. The reference beam splitting module is used to split the reference light obtained by the first polarization beam splitter into m reference beams, where m is 2 to the power of k and k is 1, 2, 3, ... A polarization state adjustment module, comprising m half-wave plates, which are respectively disposed on the optical paths of the m reference beams obtained by the reference beam splitting module. The half-wave plates are used to adjust the polarization state of the corresponding reference beams. A beam combiner is used to perform non-overlapping parallel beam combining of the m reference beams obtained by the reference beam splitting module. A spatial light modulator is disposed in the optical path of the signal light and is used to modulate the signal light; A polarization-sensitive material is disposed at the interference point between the reference light and the signal light, and the polarization-sensitive material is used to record the interference between the signal light and the reference light.

2. The polarized holographic multiplexing system based on orthogonal polarization matrices according to claim 1, characterized in that, It also includes a beam expander, which is disposed between the laser source and the aperture, and is used to expand the laser beam generated by the laser source.

3. The polarized holographic multiplexing system based on orthogonal polarization matrices according to claim 2, characterized in that, The beam expander includes a spatial filter and a beam expanding lens; The spatial filter is disposed between the laser source and the beam expander lens, and the spatial filter is used to filter the laser light generated by the laser source.

4. The polarized holographic multiplexing system based on orthogonal polarization matrices according to claim 1, characterized in that, The aperture is a rectangular aperture.

5. The polarized holographic multiplexing system based on orthogonal polarization matrices according to claim 1, characterized in that, The laser source is a fundamental mode TEM with a wavelength of 532 nm. 00 Green laser.

6. The polarized holographic multiplexing system based on orthogonal polarization matrices according to claim 1, characterized in that, The beam combiner is a beam splitter prism.

7. The polarized holographic multiplexing system based on orthogonal polarization matrices according to claim 1, characterized in that, The spatial light modulator is an amplitude-type spatial light modulator.

8. The polarized holographic multiplexing system based on orthogonal polarization matrices according to claim 1, characterized in that, It also includes an image acquisition and detection unit, which is used to capture the reproduced image recorded by the polarization-sensitive material.

9. A polarization holographic multiplexing method based on orthogonal polarization matrices, the method being based on the polarization holographic multiplexing system based on orthogonal polarization matrices as described in any one of claims 1-8, the method comprising the following steps: Laser light sources generate laser light; After passing through the aperture, the laser beam is split into signal light and reference light by the first polarization beam splitter. The reference light obtained by the first polarization beam splitter is split into m reference lights by the reference light beam splitting module. The polarization state of the m-path reference light obtained by the reference light beam splitting module is adjusted according to the orthogonal polarization matrix column; The m-path reference beams obtained by the polarization-adjusted reference beam splitting module are non-overlapping parallel beams combined using a beam combiner. The signal light is modulated using a spatial light modulator; The interference between the combined reference light and the modulated signal light is recorded using a polarization-sensitive material.

10. The polarized holographic multiplexing method based on orthogonal polarization matrices according to claim 9, characterized in that, It also includes the following steps: The image acquisition and detection unit captures the reproduced image of the polarization-sensitive material.

Images