CN117369234A - Polarization holographic multiplexing system and method based on orthogonal polarization matrix - Google Patents
Polarization holographic multiplexing system and method based on orthogonal polarization matrix Download PDFInfo
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- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
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- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
- G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
- G03H2001/267—Polarisation multiplexing
Abstract
The invention relates to a polarization holographic multiplexing system and a method based on an orthogonal polarization matrix, wherein the system comprises the following steps: a laser light source for generating laser light; the first polarization beam splitter is used for splitting laser passing through the diaphragm into signal light and reference light; the reference light beam splitting module is used for splitting the reference light beam into m reference light beams; the polarization state adjusting module comprises m half wave plates; the beam combiner is used for combining the m paths of reference light in a non-overlapping parallel manner; a spatial light modulator for modulating signal light; and the polarization sensitive material is used for recording interference between the signal light and the reference light. The dimension of the multidimensional orthogonal polarization matrix can be widened in a wireless mode, therefore, hologram multiplexing of any channel number can be achieved, and huge potential is shown in the aspect of greatly enhancing multiplexing capability of the multichannel holograms.
Description
Technical Field
The application relates to the technical field of polarization hologram technology and multiplexing, in particular to a polarization hologram multiplexing system and method based on an orthogonal polarization matrix.
Background
Volume holographic memory is considered as a potential technology for next generation data storage at its high storage density and fast transfer rate. In order to further increase the holographic storage capacity of the volume holographic memory, various multiplexing methods have been proposed. The traditional multiplexing method comprises the following steps: angle multiplexing, wavelength multiplexing, shift multiplexing, phase multiplexing, etc. With the continued progress of polarization holography research, polarization multiplexing technology, i.e., multiplexing that realizes polarization selectivity using polarization sensitivity of a polarized volume hologram, has been generated.
Polarization holography is due to the ability to be used in polarization sensitive recording materials, such as: PQ/PMMA is of great interest in simultaneously recording and retrieving the amplitude, phase and polarization of the light waves. Several polarization multiplexing methods have been proposed. However, these polarization multiplexing methods have an upper limit on the multiplexing number at one point, and at most, they can be only 4. The multiplexing number of 4 is not just 4 in the true sense, but the recorded information can be indirectly retrieved only by carrying out orthogonal separation on the reproduction light under the reconstruction of the orthogonal state reference light. However, the search for multi-channel multiplexing using polarization modulation techniques has not been widely conducted. The lack of research and development work in this area has hampered the maximization of the information capacity stored in polarization holography and limited the versatility of the technology.
To extend the polarization multiplexing number of polarization holography, it is necessary to have orthogonal matrices that are polarization-modulated. However, there is no orthogonal matrix of polarization dimensions, which prevents the application of polarization modulation and also limits multiplexing of multiple channels in polarization dimensions using polarization holography.
Disclosure of Invention
In view of the above problems, the present application provides a polarization hologram multiplexing system and method based on an orthogonal polarization matrix, which solves the existing problem that there is no orthogonal matrix of polarization dimension, limits the multiplexing of multiple channels in polarization dimension by utilizing polarization hologram technology,
to achieve the above object, the present inventors provide a polarization hologram multiplexing system based on an orthogonal polarization matrix, comprising:
a laser light source for generating laser light;
the diaphragm is arranged on the light path of the laser;
the first polarization beam splitter is arranged on the light path of the laser and is used for splitting the laser passing through the diaphragm into signal light and reference light;
the reference light beam splitting module is arranged on the light path of the reference light obtained by the beam splitting of the first polarization beam splitter and is used for splitting the reference light obtained by the beam splitting of the first polarization beam splitter into m beams of reference light, m is the k power of 2, and k is 1,2 and 3 …;
the polarization state adjusting module comprises m half-wave plates which are respectively arranged on the light paths of the m reference lights obtained by the beam splitting of the reference light beam splitting module and used for adjusting the polarization states of the corresponding reference lights;
the beam combiner is used for carrying out non-overlapping parallel beam combination on m paths of reference light obtained by beam splitting of the reference light beam splitting module; a spatial light modulator disposed on an optical path of the signal light, the spatial light modulator being configured to modulate the signal light;
the polarization sensitive material is arranged at the interference position of the reference light and the signal light and is used for recording the interference between the signal light and the reference light.
In some embodiments, the laser beam expander is arranged between the laser light source and the rectangular diaphragm, and is used for expanding the laser generated by the laser light source.
In some embodiments, the beam expander comprises a spatial filter and a beam expander lens;
the spatial filter is arranged between the laser light source and the beam expander and is used for filtering laser generated by the laser light source.
In some embodiments, the diaphragm is a rectangular diaphragm
In some embodiments, the laser source is a fundamental mode TEM having a wavelength of 532nm 00 Green laser.
In some embodiments, the beam combiner is a beam splitting prism.
In some embodiments, the spatial light modulator is an amplitude type spatial light modulator.
In some embodiments, the system further comprises an image acquisition detection unit for capturing a reproduced image of the polarization sensitive material record.
The method is based on the polarization holographic multiplexing system based on the orthogonal polarization matrix, and comprises the following steps:
the laser light source generates laser;
the laser is split into signal light and reference light through a first polarization beam splitter after passing through a diaphragm;
the reference light obtained by beam splitting of the first polarization beam splitter is split by a reference light beam splitting module to obtain m paths of reference light;
adjusting the polarization state of m paths of reference light obtained by beam splitting of the reference light beam splitting module according to the orthogonal polarization matrix array;
the beam combiner is used for carrying out non-overlapping parallel beam combination on m paths of reference light obtained by beam splitting of the reference light beam splitting module with the polarization state adjusted;
modulating the signal light by a spatial light modulator;
the interference between the combined reference light and the modulated signal light is recorded by a polarization sensitive material.
In some embodiments, the method further comprises the steps of:
and capturing the reproduced image recorded by the polarization sensitive material through an image acquisition and detection unit.
Compared with the prior art, the technical scheme is that the laser light source generates laser, and the laser is split into signal light and reference light through the first polarization beam splitter after being limited by the diaphragm; splitting the reference light obtained by splitting the first polarization beam splitter into m paths of reference light through a reference light splitting module; and then according to the orthogonal polarization matrix array, the polarization states of m paths of reference lights obtained by beam splitting of the reference light beam splitting module are adjusted through m half-wave plates in the polarization state adjusting module, so that the polarization states of the m paths of reference lights obtained by beam splitting of the reference light beam splitting module are orthogonal to the polarization matrix array, then the m paths of reference lights obtained by beam splitting of the reference light beam splitting module with the adjusted polarization states are subjected to non-overlapping parallel beam combination through a beam combiner, meanwhile, signal lights are modulated through a spatial light modulator, and finally interference between the reference lights after beam combination and the modulated signal lights is recorded through a polarization sensitive material. The polarization state combination state of the reference light is modulated by utilizing a multidimensional orthogonal polarization matrix based on a polarization holographic technology, and a plurality of pieces of information are recorded and reconstructed independently by means of a polarization sensitive material. The dimension of the multidimensional orthogonal polarization matrix can be widened in a wireless mode, therefore, hologram multiplexing of any channel number can be achieved, and huge potential is shown in the aspect of greatly enhancing multiplexing capability of the multichannel holograms.
The foregoing summary is merely an overview of the present application, and is provided to enable one of ordinary skill in the art to make more clear the present application and to be practiced according to the teachings of the present application and to make more readily understood the above-described and other objects, features and advantages of the present application, as well as by reference to the following detailed description and accompanying drawings.
Drawings
The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of the present application and are not to be construed as limiting the application.
In the drawings of the specification:
FIG. 1 is a schematic diagram of a polarization holographic multiplexing system based on orthogonal polarization matrix according to an embodiment;
FIG. 2 is a schematic diagram of another structure of a polarization holographic multiplexing system based on orthogonal polarization matrix according to an embodiment;
FIG. 3 is a schematic diagram of another structure of a polarization holographic multiplexing system based on orthogonal polarization matrix according to an embodiment;
FIG. 4 is a schematic diagram of another structure of a polarization holographic multiplexing system based on orthogonal polarization matrix according to an embodiment;
fig. 5 is a schematic flow chart of a polarization hologram multiplexing method based on orthogonal polarization matrix according to an embodiment.
Reference numerals referred to in the above drawings are explained as follows:
1. a laser light source is used for generating a laser beam,
2. a diaphragm;
3. a first polarizing beam splitter;
4. a second polarizing beam splitter;
5. a first half-wave plate is provided,
6. a second half-wave plate is provided which is arranged on the first half-wave plate,
7. the beam combiner is arranged on the beam combiner,
8. a spatial light modulator is provided which is configured to modulate,
9. a polarization sensitive material that is sensitive to light,
10. the spatial filter is used to filter the light of the light source,
11. the beam-expanding lens is used for the optical system,
12. an imaging system is provided which includes an imaging system,
13. the light beam emitted by the light source is directed to the detector,
14. a third half-wave plate is provided which is arranged on the first half-wave plate,
15. and a fourth half-wave plate.
Detailed Description
In order to describe the possible application scenarios, technical principles, practical embodiments, and the like of the present application in detail, the following description is made with reference to the specific embodiments and the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples and are not intended to limit the scope of protection of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase "in various places in the specification are not necessarily all referring to the same embodiment, nor are they particularly limited to independence or relevance from other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in the embodiments may be combined in any manner to form a corresponding implementable technical solution.
Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains; the use of related terms herein is for the description of specific embodiments only and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a representation for describing a logical relationship between objects, which means that there may be three relationships, e.g., a and/or B, representing: there are three cases, a, B, and both a and B. In addition, the character "/" herein generally indicates that the front-to-back associated object is an "or" logical relationship.
In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, order, or sequence of such entities or operations.
Without further limitation, the use of the terms "comprising," "including," "having," or other like terms in this application is intended to cover a non-exclusive inclusion, such that a process, method, or article of manufacture that comprises a list of elements does not include additional elements but may include other elements not expressly listed or inherent to such process, method, or article of manufacture.
As in the understanding of the "examination guideline," the expressions "greater than", "less than", "exceeding", and the like are understood to exclude the present number in this application; the expressions "above", "below", "within" and the like are understood to include this number. Furthermore, in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), and similarly, the expression "a plurality of" is also to be understood as such, for example, "a plurality of groups", "a plurality of" and the like, unless specifically defined otherwise.
In the description of the embodiments of the present application, spatially relative terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc., are used herein as terms of orientation or positional relationship based on the specific embodiments or figures, and are merely for convenience of description of the specific embodiments of the present application or ease of understanding of the reader, and do not indicate or imply that the devices or components referred to must have a particular position, a particular orientation, or be configured or operated in a particular orientation, and therefore are not to be construed as limiting of the embodiments of the present application.
Unless specifically stated or limited otherwise, in the description of the embodiments of the present application, the terms "mounted," "connected," "affixed," "disposed," and the like are to be construed broadly. For example, the "connection" may be a fixed connection, a detachable connection, or an integral arrangement; the device can be mechanically connected, electrically connected and communicated; it can be directly connected or indirectly connected through an intermediate medium; which may be a communication between two elements or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains according to the specific circumstances.
Linear polarization s (polarization direction perpendicular to the incident plane) with orthogonal polarization characteristics and p-polarized light are combined to form a vector of two rows and one column: (s, p) T . Taking s and p as coordinate axes, the following three groups of vectors with two-by-two orthogonal properties can be found, namely: (s, -p) T 、(p,s) T 、(p,-s) T T represents a transposed relationship. These four sets of vectors together form a matrix, called O 2×4 And satisfy O 2×4 T O 2×4 ＝E 4×4 . Thus, O 2×4 Is an orthogonal polarization matrix of minimum dimension. Multidimensional orthogonal polarization matrix O 2n×4n Can be formed by Hadamard matrix H n×n The construction method comprises the following steps:
wherein the method comprises the steps ofIs a recursive kronecker product.
The orthogonal polarization matrix column vector is used as reference light, so that the polarization multiplexing of multiple channels can be realized. Such as: using O 2n×4n Polarization multiplexing of 4n channels can be achieved. Specifically, a polarization holographic multiplexing system based on orthogonal polarization matrix for polarization multiplexing of 4n channels comprises:
a laser light source for generating laser light;
the diaphragm is arranged on the light path of the laser;
the first polarization beam splitter is arranged on the light path of the laser and is used for splitting the laser passing through the rectangular diaphragm into signal light and reference light;
the reference light beam splitting module is arranged on the light path of the reference light obtained by the beam splitting of the first polarization beam splitter and is used for splitting the reference light obtained by the beam splitting of the first polarization beam splitter into m beams of reference light, m is the k power of 2, and k is 1,2 and 3 …; the polarization multiplexing of 4n channels is realized, and m=2n is obtained by splitting the reference light obtained by the first polarization beam splitter into 2n reference light;
the polarization state adjusting module comprises m half-wave plates which are respectively arranged on the light paths of the m reference lights obtained by the beam splitting of the reference light beam splitting module and used for adjusting the polarization states of the corresponding reference lights;
the beam combiner is used for carrying out non-overlapping parallel beam combination on m paths of reference light obtained by beam splitting of the reference light beam splitting module; a spatial light modulator disposed on an optical path of the signal light, the spatial light modulator being configured to modulate the signal light;
the polarization sensitive material is arranged at the interference position of the reference light and the signal light and is used for recording the interference between the signal light and the reference light.
The laser source generates laser, and the laser is divided into signal light and reference light through the first polarization beam splitter after being limited by the diaphragm; splitting the reference light obtained by splitting the first polarization beam splitter into m paths of reference light through a reference light splitting module; and then according to the orthogonal polarization matrix array, the polarization states of m paths of reference lights obtained by beam splitting of the reference light beam splitting module are adjusted through m half-wave plates in the polarization state adjusting module, so that the polarization states of the m paths of reference lights obtained by beam splitting of the reference light beam splitting module are orthogonal to the polarization matrix array, then the m paths of reference lights obtained by beam splitting of the reference light beam splitting module with the adjusted polarization states are subjected to non-overlapping parallel beam combination through a beam combiner, meanwhile, signal lights are modulated through a spatial light modulator, and finally interference between the reference lights after beam combination and the modulated signal lights is recorded through a polarization sensitive material. The polarization state combination state of the reference light is modulated by utilizing a multidimensional orthogonal polarization matrix based on a polarization holographic technology, and a plurality of pieces of information are recorded and reconstructed independently by means of a polarization sensitive material. The dimension of the multidimensional orthogonal polarization matrix can be widened in a wireless mode, therefore, hologram multiplexing of any channel number can be achieved, and huge potential is shown in the aspect of greatly enhancing multiplexing capability of the multichannel holograms. Taking 4-channel multiplexing as an example, referring to fig. 1, the present embodiment provides a polarization holographic multiplexing system based on an orthogonal polarization matrix, where the orthogonal polarization matrix is O 2×4 The system comprises:
a laser light source 1, the laser light source 1 being for generating laser light;
a diaphragm 2, the diaphragm 2 being arranged on the optical path of the laser; preferably, the diaphragm 2 is a rectangular diaphragm.
A first polarizing beam splitter 3, wherein the first polarizing beam splitter 3 is arranged on the optical path of the laser, and the first polarizing beam splitter 3 is used for splitting the laser passing through the rectangular diaphragm into signal light and reference light;
the reference light beam splitting module comprises a second polarization beam splitter 4, wherein the second polarization beam splitter 4 is arranged on an optical path of the reference light, and the second polarization beam splitter 4 is used for splitting the reference light into a first reference light and a second reference light;
the polarization state adjusting module comprises a first half-wave plate 5 and a second half-wave plate 6, the first half-wave plate 5 is arranged on the optical path of the first reference light, and the first half-wave plate 5 is used for adjusting the polarization state of the first reference light;
the second half-wave plate 6 is arranged on the optical path of the second reference light, and the second half-wave plate 6 is used for adjusting the polarization state of the second reference light;
a beam combiner 7, wherein the beam combiner 7 is arranged at the joint between the optical path of the first reference light and the optical path of the second reference light, and the beam combiner 7 is used for performing non-overlapping parallel beam combination on the first reference light and the second reference light;
a spatial light modulator 8, the spatial light modulator 8 being disposed on an optical path of the signal light, the spatial light modulator 8 being configured to modulate the signal light;
and a polarization sensitive material 9, wherein the polarization sensitive material 9 is arranged at the interference position of the reference light and the signal light, and the polarization sensitive material 9 is used for recording the interference between the signal light and the reference light.
The laser source generates laser, and the laser is limited by the rectangular diaphragm and then is split into signal light and reference light by the first polarization beam splitter; splitting the reference light by a second polarization beam splitter to obtain first reference light and second reference light; and then according to the orthogonal polarization matrix array, the polarization state of the first reference light is regulated through the first half-wave plate, and the polarization state of the second reference light is regulated through the second half-wave plate, so that the polarization state of the first reference light and the polarization state of the second reference light are orthogonal to the polarization matrix array, then the first reference light and the second reference light with the regulated polarization states are subjected to non-overlapping parallel beam combination through the beam combiner, and after the non-overlapping parallel beam combination, the reproduction light on each component can be subjected to vector superposition, so that the effect identical to the inner product between the two vectors is achieved. The result of the product of the corresponding positions of the reference light is expressed as the reproduction light obtained on the component, and the result of the summation of the reproduction light on each component is equivalent to the inner product; and meanwhile, modulating the signal light through a spatial light modulator, and finally recording the interference of the combined reference light and the modulated signal light through a polarization sensitive material. The polarization state combination state of the reference light is modulated by utilizing a multidimensional orthogonal polarization matrix based on a polarization holographic technology, and a plurality of pieces of information are recorded and reconstructed independently by means of a polarization sensitive material. The dimension of the multidimensional orthogonal polarization matrix can be widened in a wireless mode, therefore, hologram multiplexing of any channel number can be achieved, and huge potential is shown in the aspect of greatly enhancing multiplexing capability of the multichannel holograms.
In this embodiment, a polarization hologram multiplexing system based on an orthogonal polarization matrix is provided by providing a method of constructing a multidimensional orthogonal polarization matrix composed of polarization combinations, and using the same to realize polarization multi-channel multiplexing in polarization hologram. The method employs polarization sensitive materials such as: PQ/PMMA is used as a recording medium, and p (polarization direction parallel to the incident plane) polarized signal light carrying different desired information is recorded at an interference angle of 90 ° for a plurality of times by constituting reference light by column vectors in orthogonal polarization matrices, respectively. In the reproduction process, when different read reference lights which are formed by combining column vectors in the orthogonal polarization matrix are used for irradiating the recording medium, the recorded different information with p polarization states can be respectively reconstructed, so that the recording and the reconstruction of the multi-channel hologram are further realized.
Referring to fig. 2-4, in some embodiments, the laser beam expander further includes a beam expander, where the beam expander is disposed between the laser light source and the rectangular diaphragm, and the beam expander is configured to expand the laser beam generated by the laser light source. Wherein, a laser light source with larger diameter for outputting laser light can be used for generating laser light, and when a laser light source with smaller diameter for outputting laser light is adopted, a beam expander is arranged between the laser light source and the rectangular diaphragm and is used for expanding the laser light generated by the laser light source, wherein, the beam expander comprises a spatial filter 10 and a beam expanding lens 11; the spatial filter 10 is disposed between the laser light source 1 and the beam expanding lens 11, and the spatial filter 10 is used for filtering the laser light generated by the laser light source. The laser beam generated by the laser light source is filtered by the spatial filter 10 to remove the wave surface deformity caused by dust or the reflecting mirror surface attached to the laser light source, thereby obtaining a more ideal spherical wave.
In some embodiments, the laser source is a fundamental mode TEM having a wavelength of 532nm 00 Green laser.
In some embodiments, the beam combiner is a beam splitting prism. The beam splitting prism not only can split the light beams, but also can combine the two light beams, and the first reference light and the second reference light can be combined in a non-overlapping parallel manner through the beam splitting prism.
In some embodiments, the spatial light modulator 8 is an amplitude type spatial light modulator. The signal light is amplitude information modulated by using an amplitude type spatial light modulator. In other embodiments, the spatial light modulator 8 may be a phase spatial light modulator, and when the phase spatial light modulator is used, the polarization state of the signal light on the optical path is p-polarized, and the condition of multi-channel multiplexing is satisfied only when p-polarized light is used as the signal light and the interference angle of the signal light and the reference light is 90 °.
Referring to fig. 3-4, in some embodiments, an image acquisition detection unit is further included for capturing a reproduced image of the polarization sensitive material record.
The reproduced image of the polarization sensitive material can be captured by the image acquisition detection unit. The image acquisition module consists of an imaging system 12 and a detector 13, wherein the imaging system 12 consists of two lenses, and the detector 13 adopts a CCD detector.
In this example, polarization sensitivity was achieved with PQ/PMMA materials made from Phenanthrenequinone (PQ), 2-Azobisisobutyronitrile (AIBN), and Methyl Methacrylate (MMA) materials.
Referring to fig. 4, in some embodiments, a third half-wave plate 14 is disposed between the beam expander and the first polarizing beam splitter 3, a fourth half-wave plate 15 is disposed between the first polarizing beam splitter 3 and the second polarizing beam splitter 4, the light intensity ratio of the two beams of light obtained by splitting the beam through the first polarizing beam splitter 3 is adjusted by the third half-wave plate 14, and the light intensity ratio of the two beams of light obtained by splitting the beam through the second polarizing beam splitter 4 is adjusted by the fourth half-wave plate 15.
Referring to fig. 5, in another embodiment, a polarization hologram multiplexing method based on an orthogonal polarization matrix, which is based on the polarization hologram multiplexing system based on an orthogonal polarization matrix, includes the following steps:
step S510: the laser light source generates laser;
step S520: the laser is split into signal light and reference light through a first polarization beam splitter after passing through a diaphragm;
step S530: the reference light obtained by beam splitting of the first polarization beam splitter is split by a reference light beam splitting module to obtain m paths of reference light;
step S540: adjusting the polarization state of m paths of reference light obtained by beam splitting of the reference light beam splitting module according to the orthogonal polarization matrix array;
step S550: the beam combiner is used for carrying out non-overlapping parallel beam combination on m paths of reference light obtained by beam splitting of the reference light beam splitting module with the polarization state adjusted;
step S560: modulating the signal light by a spatial light modulator;
step S570: the interference between the combined reference light and the modulated signal light is recorded by a polarization sensitive material. The laser source generates laser, and the laser is divided into signal light and reference light through the first polarization beam splitter after being limited by the diaphragm; splitting the reference light obtained by splitting the first polarization beam splitter into m paths of reference light through a reference light splitting module; and then according to the orthogonal polarization matrix array, the polarization states of m paths of reference lights obtained by beam splitting of the reference light beam splitting module are adjusted through m half-wave plates in the polarization state adjusting module, so that the polarization states of the m paths of reference lights obtained by beam splitting of the reference light beam splitting module are orthogonal to the polarization matrix array, then the m paths of reference lights obtained by beam splitting of the reference light beam splitting module with the adjusted polarization states are subjected to non-overlapping parallel beam combination through a beam combiner, meanwhile, signal lights are modulated through a spatial light modulator, and finally interference between the reference lights after beam combination and the modulated signal lights is recorded through a polarization sensitive material. The polarization state combination state of the reference light is modulated by utilizing a multidimensional orthogonal polarization matrix based on a polarization holographic technology, and a plurality of pieces of information are recorded and reconstructed independently by means of a polarization sensitive material. The dimension of the multidimensional orthogonal polarization matrix can be widened in a wireless mode, therefore, hologram multiplexing of any channel number can be achieved, and huge potential is shown in the aspect of greatly enhancing multiplexing capability of the multichannel holograms.
In this embodiment, polarization multi-channel multiplexing is achieved in polarization holography by providing a method of constructing a multi-dimensional orthogonal polarization matrix composed of polarization combinations. The method employs polarization sensitive materials such as: PQ/PMMA is used as a recording medium, and p (polarization direction parallel to the incident plane) polarized signal light carrying different desired information is recorded at an interference angle of 90 ° for a plurality of times by constituting reference light by column vectors in orthogonal polarization matrices, respectively. In the reproduction process, when different read reference lights which are formed by combining column vectors in the orthogonal polarization matrix are used for irradiating the recording medium, the recorded different information with p polarization states can be respectively reconstructed, so that the recording and the reconstruction of the multi-channel hologram are further realized.
Linear polarization s (polarization direction perpendicular to the incident plane) with orthogonal polarization characteristics and p-polarized light are combined to form a vector of two rows and one column: (s, p) T . Taking s and p as coordinate axes, the following three groups of vectors with two-by-two orthogonal properties can be found, namely: (s, -p) T 、(p,s) T 、(p,-s) T T represents a transposed relationship. These four sets of vectors together form a matrix, called O 2×4 And satisfy O 2×4 T O 2×4 ＝E 4×4 . Thus, O 2×4 Is an orthogonal polarization matrix of minimum dimension. Multidimensional orthogonal polarization matrix O 2n×4n Can be formed by Hadamard matrix H n×n The construction method comprises the following steps:
wherein the method comprises the steps ofIs a recursive kronecker product.
The orthogonal polarization matrix column vector is used as reference lightTo achieve polarization multiplexing of multiple channels. Such as: using O 2n×4n Polarization multiplexing of 4n channels can be achieved.
In some embodiments, the method further comprises the steps of:
and capturing the reproduced image recorded by the polarization sensitive material through an image acquisition and detection unit.
The image acquisition and detection unit can capture the reproduced image recorded by the polarization sensitive material. The image acquisition module consists of an imaging system and a detector, wherein the imaging system consists of two lenses, and the detector adopts a CCD detector.
Finally, it should be noted that, although the foregoing embodiments have been described in the text and the accompanying drawings of the present application, the scope of the patent protection of the present application is not limited thereby. All technical schemes generated by replacing or modifying equivalent structures or equivalent flows based on the essential idea of the application and by utilizing the contents recorded in the text and the drawings of the application, and the technical schemes of the embodiments are directly or indirectly implemented in other related technical fields, and the like, are included in the patent protection scope of the application.
Claims (10)
1. A polarization holographic multiplexing system based on orthogonal polarization matrix, comprising:
a laser light source for generating laser light;
the diaphragm is arranged on the light path of the laser;
the first polarization beam splitter is arranged on the light path of the laser and is used for splitting the laser passing through the diaphragm into signal light and reference light;
the reference light beam splitting module is arranged on the light path of the reference light obtained by the beam splitting of the first polarization beam splitter and is used for splitting the reference light obtained by the beam splitting of the first polarization beam splitter into m beams of reference light, m is the k power of 2, and k is 1,2 and 3 …;
the polarization state adjusting module comprises m half-wave plates which are respectively arranged on the light paths of the m reference lights obtained by the beam splitting of the reference light beam splitting module and used for adjusting the polarization states of the corresponding reference lights;
the beam combiner is used for carrying out non-overlapping parallel beam combination on m paths of reference light obtained by beam splitting of the reference light beam splitting module;
a spatial light modulator disposed on an optical path of the signal light, the spatial light modulator being configured to modulate the signal light;
the polarization sensitive material is arranged at the interference position of the reference light and the signal light and is used for recording the interference between the signal light and the reference light.
2. The orthogonal polarization matrix based polarization holographic multiplexing system of claim 1, further comprising a beam expander disposed between the laser light source and the stop, the beam expander configured to expand the laser light generated by the laser light source.
3. The orthogonal polarization matrix based polarization holographic multiplexing system of claim 2, wherein the beam expander comprises a spatial filter and a beam expander lens;
the spatial filter is arranged between the laser light source and the beam expander and is used for filtering laser generated by the laser light source.
4. The orthogonal polarization matrix based polarization holographic multiplexing system of claim 1, wherein the aperture is a rectangular aperture.
5. The orthogonal polarization matrix based polarization holographic multiplexing system of claim 1, wherein the laser light source is a fundamental mode TEM with a wavelength of 532nm 00 Green laser.
6. The orthogonal polarization matrix based polarization holographic multiplexing system of claim 1, wherein the beam combiner is a beam splitting prism.
7. The orthogonal polarization matrix based polarization holographic multiplexing system of claim 1, wherein the spatial light modulator is an amplitude type spatial light modulator.
8. The orthogonal polarization matrix based polarization holographic multiplexing system of claim 1, further comprising an image acquisition detection unit for capturing a reconstructed image of a polarization sensitive material record.
9. A polarization hologram multiplexing method based on an orthogonal polarization matrix, the method being based on the polarization hologram multiplexing system based on an orthogonal polarization matrix according to any one of claims 1 to 8, the method comprising the steps of:
the laser light source generates laser;
the laser is split into signal light and reference light through a first polarization beam splitter after passing through a diaphragm;
the reference light obtained by beam splitting of the first polarization beam splitter is split by a reference light beam splitting module to obtain m paths of reference light;
adjusting the polarization state of m paths of reference light obtained by beam splitting of the reference light beam splitting module according to the orthogonal polarization matrix array;
the beam combiner is used for carrying out non-overlapping parallel beam combination on m paths of reference light obtained by beam splitting of the reference light beam splitting module with the polarization state adjusted;
modulating the signal light by a spatial light modulator;
the interference between the combined reference light and the modulated signal light is recorded by a polarization sensitive material.
10. The orthogonal polarization matrix-based polarization holographic multiplexing method of claim 9, further comprising the steps of:
and capturing the reproduced image recorded by the polarization sensitive material through an image acquisition and detection unit.
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