Light field information coupler

Abstract

The present invention provides a light field information coupler, including a spectroscopic element and a light trap, wherein the spectroscopic element includes a spectroscopic surface, a light beam incident end, a light beam exit end, a light beam coding end and a light trap end. The light beam to be coded enters the spectroscopic element from the light beam incident end and is divided into two paths by the spectroscopic surface. One path is emitted from the light trap end after turning to the light trap for extinction, and the other path is emitted from the light beam coding end, becomes a coded light beam after light field coding, and is reflected back to the spectroscopic element, and then is deflected by the spectroscopic surface and emitted from the light beam exit end. The present invention absorbs the light energy that does not participate in the normal coding output by setting a light trap, and eliminates the influence of such energy on the output coded light beam in the form of stray light. The present invention also deviates the multiple reflected light from the optical surface from the coding light path by adding structures such as a light extinction reflector and an anti-reflection film to the spectrometer, and designs the optical surface with a small inclination angle, thereby significantly reducing the influence of the multiple reflected light on the coded light beam in the form of stray light.

Description

Technical Field

[0001] The present invention relates to the technical field of light beam coding and light field modulation, and in particular to a light field information coupler for calculating optical light beam coding regulation. Background Art

[0002] Computational optics is an emerging cross-disciplinary research field that integrates theories of geometric optics, physical optics, information optics, computational imaging, modern signal processing, and biomedical photonics. By applying the idea of ​​computer information processing, computational optics combines optical system modulation with back-end signal processing algorithms, making information that is invisible under traditional optical means such as lighting and imaging visible, or greatly enhancing the performance of instruments, providing unprecedented perception (such as resolution, depth of field, field of view, information dimension, and dynamic range) that far exceeds traditional imaging technology and human vision. As a result, computational optics technology has surpassed the application limits of traditional optical instruments and is now being rapidly applied to a wide range of fields such as high-performance optical imaging, three-dimensional optical imaging and scene modeling and recognition, high-precision measurement, optical sensing, remote sensing detection, material analysis, signal detection, recognition and processing, quantum imaging, optical computing, and deep learning.

[0003] Specifically, computational optics improves the indicators of computational optical instruments (such as signal-to-noise ratio, contrast, dynamic range, etc.), simplifies computational optical instrument systems (such as fewer or no lenses to reduce size and cost), and breaks through the physical limitations of optical systems and image acquisition devices (such as diffraction limit, sampling limit, imaging dimension, resolution, and field of view) by organically combining optical control (such as structured illumination, aperture coding, additional optical transmission functions, sub-aperture segmentation, controllable detector displacement, etc.) with information processing (such as coherent demodulation, phase restoration, light field control, compressed sensing, single-pixel reconstruction, deconvolution, and optimal reconstruction, etc.), ultimately achieving high performance, miniaturization, and intelligence of computational optical instruments and equipment.

[0004] In the above-mentioned computational optics technology applications, it is often necessary to encode the light beam directly or indirectly, that is, for a beam of regular wavefront to be encoded (generally a plane wavefront or a spherical wavefront), by encoding the wavefront phase 0-1 or quantizing it on the wavefront surface, the light beam to be encoded obtains two-dimensional, three-dimensional and time-dependent encoding of the phase on the wavefront surface, and becomes a coded beam. The light field information to be used is carried by the coded beam in a coded form. The coded beam enables computational optics technology to utilize the physical properties of light such as diffraction, scattering, interference and focusing imaging to interact with the coding, process and extract the coded information, and thus interpret and process the light field.

[0005] At present, there are two commonly used methods for coupling light field information into light beams: transmission coupling and reflection coupling. Transmission coupling: Use a beam of parallel light to illuminate the coding medium such as the liquid crystal film to be encoded, the transparent sample to be tested, and the light-transmitting thin film processed with the coding pattern. After the wavefront of the parallel light passes through the coding medium, it is blocked and delayed according to the medium transmittance and refractive index, and becomes a coding wavefront. The disadvantages of this method are: 1. The coding medium must be a transparent material or the coding pattern is composed of opaque and transparent materials. 2. The coding range is limited by the placement of the coding area of ​​the coupler. The transmission coupler has an optical path structure before and after the coding area, which limits the ability to adjust the width of the coding area, and the coding area needs to be within the range of the light beam, so the area of ​​the coding area will be limited by the area of ​​the light beam. 3. If a beam expansion optical path is used, the beam expansion element will not only affect the compactness of the light beam, but also the beam expansion range is difficult to make large at an acceptable cost, and a larger coding range cannot be achieved.

[0006] Reflective coupling: Use a parallel light beam to illuminate the sample to be encoded, and then reflect the light to another angle for reception through the encoding sample itself or the reflective material behind the encoding sample. Reflective coupling can be divided into two methods: original path return and non-original path return. For the non-original path return method, the beam reflection angle has a greater impact on the distribution of the code on the wavefront surface, and the optical path needs to be precisely adjusted, and a high structural accuracy needs to be maintained, resulting in an increase in production costs. In addition, the problem of different phase delays in different areas of the beam caused by non-original path return must also be dealt with. For the original path return method, a semi-transparent and semi-reflective element is usually installed in the optical path to reflect the returned coded beam out of the original optical path so that it can be received; due to its own semi-transparent and semi-reflective characteristics, at least 75% of the energy of the semi-transparent and semi-reflective element is not normally output in the form of coding, but is reflected in the optical path. This part of the energy eventually enters the coded beam in the form of stray light; in addition, multiple reflections of the beam on the surface of the semi-transparent and semi-reflective element will also be mixed into the coded beam in the form of stray light, and finally emitted together with the coded beam. The stray light intensity can reach 5% to 30% of the coded beam, which reduces the quality of the coded beam and affects the final coding effect. Summary of the invention

[0007] The present invention provides a light field information coupler for coding and regulating computational optical beams to solve the problems of limited aperture in light field coding regions and serious influence of stray light on coded beams in computational optics and optical detection.

[0008] To achieve the above object, the present invention adopts the following specific technical solutions:

[0009] The present invention provides a light field information coupler, comprising: a spectroscopic element and a light trap, wherein the spectroscopic element comprises a spectroscopic surface, a light beam incident end, a light beam exit end, a light beam coding end and a light trap end, wherein a light beam to be coded enters the spectroscopic element from the light beam incident end and is divided into two paths by the spectroscopic surface, one path is emitted from the light trap end after turning to be extinct in the light trap, and the other path is emitted from the light beam coding end, becomes a coded light beam after light field coding, is reflected back to the spectroscopic element, and then is emitted from the light beam exit end after being turned by the spectroscopic surface.

[0010] Preferably, the beam splitting element is a beam splitter or a beam splitter.

[0011] Preferably, the beam splitter is a quadrangular prism or a triangular prism.

[0012] Preferably, when the beam splitter is a quadrangular prism, extinction reflective sheets are respectively provided at the light beam incident end, the light beam emitting end, the light beam encoding end and the light trap end.

[0013] Preferably, when the beam splitter is a triangular prism, extinction reflective sheets are provided at the light beam incident end and the light beam encoding end, respectively.

[0014] Preferably, the extinction reflective sheet is a wedge-shaped light-transmitting sheet with two surfaces forming a wedge angle θ.

[0015] Preferably, the wedge angle of the wedge-shaped light-transmitting sheet is 0<θ≤10°, and the angle formed by the wedge-shaped light-transmitting sheet and the vertical cross section of the corresponding light beam direction is ≤10°.

[0016] Preferably, surfaces of two adjacent wedge-shaped light-transmitting sheets are not perpendicular and the angle formed therebetween deviates from a right angle within ±10°.

[0017] Preferably, the surfaces of the two opposing wedge-shaped light-transmitting sheets are not perpendicular and deviate from the parallel plane within ±10°.

[0018] Preferably, among the four surfaces of the beam splitter corresponding to the light beam incident end, the light beam exit end, the light beam encoding end and the light trap end, two adjacent surfaces are perpendicular and / or two opposite surfaces are parallel.

[0019] Preferably, the four surfaces are perpendicular or non-perpendicular to the respective corresponding light beam directions.

[0020] Preferably, two surfaces of the beam splitter corresponding to the light beam incident end and the light trap end are perpendicular.

[0021] Preferably, the two surfaces are perpendicular or non-perpendicular to the respective corresponding light beam directions.

[0022] Preferably, two adjacent wedge-shaped light-transmitting sheets are arranged with a wedge angle facing a converging direction or a diverging direction.

[0023] Preferably, an anti-reflection film is coated on the surface of the matte reflective sheet.

[0024] Preferably, the surface of the quadrangular prism or the triangular prism is not perpendicular to the direction of the light beam, and a reflective film is coated on the surface of the quadrangular prism or the triangular prism.

[0025] Preferably, the light beam incident end and the light trap end are located on one side of the light splitting surface, and the light beam exit end and the light beam encoding end are located on the other side of the light splitting surface.

[0026] Preferably, the light beam incident end and the light beam encoding end are located on one side of the light splitting surface, and the light beam exit end and the light trap end are located on the other side of the light splitting surface.

[0027] Preferably, the light trap is a light absorbing layer arranged at the end of the light trap.

[0028] Preferably, the light trap is a light absorbing coating coated on the surface of the beam splitter corresponding to the light trap end.

[0029] Preferably, the light trap is a light-absorbing coating coated on the extinction reflective sheet corresponding to the end of the light trap.

[0030] The present invention can achieve the following technical effects:

[0031] (1) Through the compact structure, the light beam can be coupled with various encoding components or encoding optical paths through the light field information coupler for light field encoding, and then returned to the light field information coupler and output from the output end. By implementing the light field encoding of the light beam in this way, it can be ensured that the aperture and parallelism of the encoded light beam at the output end are consistent with the optical indicators corresponding to the uncoded light beam at the input end, and the consistency of the light beam quality is ensured with a compact structure, which greatly facilitates the continued processing and utilization of the light beam.

[0032] (2) The light field coding end of the spectrometer adopts a beam return design. Optical devices such as beam expanders and beam shrinkers can be attached to the rear side of the light field coding end. This can be used to encode light fields of different apertures and shapes in engineering, greatly relaxing the restrictions on the range and shape of the light field, making the light field information coupler more adaptable to practical application needs.

[0033] (3) The present invention significantly reduces the influence of stray light on the coded light beam and improves the quality of the coded light beam and the coding effect by applying an extinction reflector, an anti-reflection film, a light trap to the spectroscopic element and appropriately designing the inclination angle of the reflecting surface of the extinction reflector. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a light field information coupler according to Embodiment 1 of the present invention;

[0035] Figure 2 is a schematic structural diagram of a light field information coupler according to Embodiment 2 of the present invention;

[0036] Figure 3 is a schematic structural diagram of a light field information coupler according to Embodiment 3 of the present invention;

[0037] Figure 4 is a schematic structural diagram of a light field information coupler according to Embodiment 4 of the present invention;

[0038] Figure 5 is a schematic structural diagram of a light field information coupler according to Embodiment 5 of the present invention;

[0039] Figure 6 is a schematic structural diagram of a light field information coupler according to Embodiment 6 of the present invention;

[0040] Figure 7 is a schematic structural diagram of a light field information coupler according to Embodiment 7 of the present invention;

[0041] Figure 8 It is a schematic diagram of the structure of the light field information coupler according to Example 8 of the present invention.

[0042] The reference numerals include: spectrometer 1, spectroscopic surface 101, beam incident end 102, beam exit end 103, beam coding end 104, light trap end 105, light beam incident end extinction reflector 106, beam exit end extinction reflector 107, beam coding end extinction reflector 108, light trap end extinction reflector 109, light trap 2, spectrometer 3, beam incident end 301, beam exit end 302, beam coding end 303, light trap end 304, light beam to be coded 401, coded light beam 402. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0044] Since the light beam that does not participate in the coding will be mixed into the coding light beam in the form of stray light, in order to eliminate the stray light, the design idea of ​​the light field information coupler of the present invention is: use a spectroscopic element to deflect the light beam that does not participate in the coding, so that it deviates from the optical path of the coding light beam and exits the coupler, and then extinguishes it through a light trap, thereby preventing the light beam that does not participate in the coding from being mixed into the coding light beam in the form of stray light and affecting the coding light beam. The present invention improves the quality of the coding light beam and the coding effect by eliminating stray light.

[0045] According to the above-mentioned design ideas for the light field information coupler, the light field information coupler provided by the present invention includes a spectroscopic element and a light trap. The spectroscopic element includes a spectroscopic surface, a light beam incident end, a light beam exit end, a light beam coding end and a light trap end. The spectroscopic surface is used to split the light beam, separate the light beam that does not participate in the encoding and the light beam that participates in the encoding, and absorb light through the light trap. The light beam incident end, the light beam coding end, the light trap end and the light beam exit end correspond to the incident direction of the light beam, the exit direction of the light beam participating in the encoding, the exit direction of the light beam that does not participate in the encoding and the exit direction of the encoded light beam, respectively.

[0046] In the present invention, the positions of the beam incident end, the light trap end, the beam coding end and the beam exit end are not unique. The beam incident end and the beam coding end may be located on the same side of the beam splitting surface, and the light trap end and the beam exit end may be located on the other side of the beam splitting surface; or, the beam incident end and the light trap end may be located on the same side of the beam splitting surface, and the beam coding end and the beam exit end may be located on the other side of the beam splitting surface.

[0047] The beam encoding end is provided with encoding components or encoding optical paths to perform light field encoding on the light beam emitted from the beam exit end. The encoded light beam formed after encoding is reflected back to the beam splitter. The light field encoding end of the beam splitter adopts this beam return design, so that optical devices such as beam expansion and beam reduction can be attached to the rear side of the light field encoding end, which can be used for light field encoding of different calibers and shapes in engineering, greatly relaxing the restrictions on the range and shape of the light field, so that the light field information coupler has a strong adaptability to the actual application needs.

[0048] A light trap is set at the light trap end to absorb the energy of the light beam emitted from the light trap end. The light trap is made of light-absorbing materials. Extinction in the present invention refers to absorbing the energy of the light beam that does not participate in the coding light beam by the light trap, so as to prevent these light beams from mixing into the coding light beam in the form of stray light and affecting the coding light beam.

[0049] The light beam to be coded enters the spectroscopic element from the incident end of the light beam and is divided into two paths by the spectroscopic surface. One path is emitted from the light trap end after turning to the light trap for extinction, and the other path is emitted from the beam coding end, becomes a coded light beam after light field coding and is reflected back to the spectroscopic element, and then is folded by the spectroscopic surface and emitted from the light beam exit end. This realizes the absorption of stray light and the light field coding of the light beam to be coded.

[0050] Through a compact structure (including at least two optical elements), the light beam can be coupled with various encoding components or encoding optical paths through the light field information coupler for light field encoding, and then returned to the light field information coupler and output from the output end. By implementing light field encoding of the light beam in this way, it can be ensured that the aperture and parallelism of the encoded light beam at the output end are consistent with the optical indicators corresponding to the uncoded light beam at the input end, and the consistency of the light beam quality is ensured with a compact structure, which greatly facilitates the continued processing and utilization of the light beam.

[0051] The beam splitter element in the present invention can be a beam splitter or a beam splitter sheet. When the beam splitter element is a beam splitter sheet, the beam splitter sheet is in the shape of a thin sheet. When the beam splitter element is a beam splitter, the beam splitter can be a quadrangular prism or a triangular prism.

[0052] When the spectroscopic element is a spectrometer, in order to further reduce the interference of stray light on the coded light beam, the surfaces at each end of the spectrometer can be designed so that each surface is not perpendicular to the direction of the corresponding light beam, thereby guiding the stray light to deviate from the direction of the coded light beam and reducing the influence of the stray light on the coded light beam.

[0053] Since the structures of the triangular prism and the quadrangular prism are different, the designs of the surfaces of the beam splitter are also different. The two cases are described in detail below.

[0054] 1. Triangular Prism

[0055] The triangular prism is equivalent to half of the quadrangular prism. Based on the characteristics of its own structure, as long as the surface of the triangular prism corresponding to the incident end of the light beam is not perpendicular to the direction of the incident light beam, and the surface of the triangular prism corresponding to the light trap end is not perpendicular to the emission direction of the light beam not participating in the coding, the stray light can be guided to deviate from the direction of the coding light beam. There are three ways to achieve the above purpose. The first is to add an extinction reflector with a wedge angle in front of the surface of the light trap end and the surface of the light beam incident end. The function of the wedge angle is to make the reflective surfaces of the two extinction reflectors not perpendicular to the direction of the incident light beam and the emission direction of the light beam not participating in the coding, so as to reflect the stray light and make it deviate from the direction of the coding beam; the second is to adjust the placement angle of the triangular prism so that the surface of the light trap end is not perpendicular to the direction of the incident light beam and the surface of the light beam incident end is not perpendicular to the emission direction of the light beam not participating in the coding, and at the same time, the surface of the light trap end and the surface of the light beam incident end are coated with a reflective film to reflect the stray light and make it deviate from the direction of the coding beam; the third is to process the surface of the light trap end and the surface of the light beam incident end into a shape that is not perpendicular to the two, so that the surface of the light trap end is not perpendicular to the direction of the incident light beam and the surface of the light beam incident end is not perpendicular to the emission direction of the light beam not participating in the coding, so as to reflect the stray light and make it deviate from the direction of the coding beam.

[0056] Of course, the above three designs may also be performed only on the surface of the triangular prism corresponding to the light beam incident end or the surface of the triangular prism corresponding to the light trap end to achieve the guidance of stray light.

[0057] 2. Four-sided prism

[0058] The above three methods can also be used to guide stray light for a quadrangular prism, except that when the first method is used, the extinction reflector can be set on any one or more surfaces of the four beam entrance and exit ends (a general term for the beam incident end, the light trap end, the beam encoding end, and the beam exit end). When the third method is used, any one or more surfaces of the four beam entrance and exit ends are processed into a shape that is not perpendicular to the corresponding beam direction.

[0059] In a specific embodiment of the present invention, the extinction reflective sheet with a wedge angle added to the surface of the quadrangular prism or the triangular prism is a wedge-shaped light-transmitting sheet, and one end of the wedge-shaped light-transmitting sheet with the wedge angle can face any direction of the surface of the quadrangular prism or the triangular prism. Preferably, the wedge angle θ of the wedge-shaped light-transmitting sheet is ≤10°, and the angle formed by the wedge-shaped light-transmitting sheet and the vertical section of the corresponding light beam direction is ≤10°, so as to reduce the interference of stray light on the coded light beam.

[0060] In another specific embodiment of the present invention, the surfaces of two adjacent wedge-shaped light-transmitting sheets may be perpendicular to each other to form a right angle, or may not be perpendicular to each other. However, it is required that the surfaces of the two wedge-shaped light-transmitting sheets deviate from the right angle within ±10° to reduce the interference of stray light on the coded light beam.

[0061] Two adjacent wedge-shaped light-transmitting sheets are arranged with a wedge angle facing a converging direction or a diverging direction. The present invention does not limit the arrangement direction of the wedge-shaped light-transmitting sheets.

[0062] In one example of the present invention, an anti-reflection film may be coated on the surface of the wedge-shaped light-transmitting sheet to further reduce the interference of stray light on the coded light beam.

[0063] The light trap can be a light absorbing layer set separately on one side of the light trap end, or a light absorbing coating coated on the light trap end of the beam splitter or on the extinction reflector corresponding to the light trap end. When the beam splitting element is a beam splitter, the light trap can only be a light absorbing layer set on one side of the light trap end.

[0064] Several structures of the light field information coupler provided by the present invention are described in detail below with reference to several specific embodiments.

[0065] Example 1

[0066] Figure 1 The structure of the light field information coupler according to Embodiment 1 of the present invention is shown.

[0067] like Figure 1 As shown, the light field information coupler provided by Example 1 of the present invention includes: a beam splitter 1 and a light trap 2. The beam splitter 1 is a quadrangular prism, including a beam splitting surface 101, a light beam incident end 102, a light beam exit end 103, a light beam coding end 104 and a light trap end 105. The four surfaces of the beam splitter 1 corresponding to the light beam incident end 102, the light beam exit end 103, the light beam coding end 104 and the light trap end 105 are respectively perpendicular to the corresponding light beam directions, and two adjacent surfaces are perpendicular to each other.

[0068] A beam incident end extinction reflector 106 is provided at the beam incident end 102 , a beam exit end extinction reflector 107 is provided at the beam exit end 103 , a beam encoding end extinction reflector 108 is provided at the beam encoding end 104 , and a light trap end extinction reflector 109 is provided at the light trap end 105 .

[0069] For the light beam incident end extinction reflector 106, the light beam passes through the light beam incident end extinction reflector 106 from left to right. For the light beam exit end extinction reflector 107, the light beam passes through the light beam exit end extinction reflector 107 from top to bottom. For the light beam coding end extinction reflector 108, the light beam first passes through the light beam coding end extinction reflector 108 from left to right to be emitted to the light beam coding end 104, and then passes through the light beam coding end extinction reflector 108 from right to left to return to the beam splitter 1. For the light trap end extinction reflector 109, the light beam passes through the light trap end extinction reflector 109 from bottom to top.

[0070] The extinction reflector 106 at the incident end of the beam, the extinction reflector 107 at the emitting end of the beam, the extinction reflector 108 at the encoding end of the beam, and the extinction reflector 109 at the light trap end allow the light beam to pass in the working direction and eliminate the light beam reaching the extinction reflector from other directions.

[0071] The light beam 401 to be encoded enters the spectrometer 1 from the light beam incident end 102, and is divided into two light beams through the spectrometer surface 101. One light beam is bent to the light trap end 105, and emitted from the light trap end 105 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to perform extinction; the other light beam is emitted from the light beam encoding end 104, and is converted into a coded light beam 402 after being encoded by the light field by the outside world, and is reflected back to the spectrometer 1, bent through the spectrometer surface 101, and emitted from the light beam exit end 103.

[0072] The light trap 2 can eliminate stray light, while the extinction reflector 106 at the incident end of the beam, the extinction reflector 107 at the output end of the beam, the extinction reflector 108 at the coding end of the beam, and the extinction reflector 109 at the light trap end can guide the stray light to deviate from the coded light beam 402, thereby reducing the influence of stray light on the coded light beam 402 through two means.

[0073] Example 2

[0074] Figure 2 The structure of the light field information coupler according to Embodiment 2 of the present invention is shown.

[0075] like Figure 2 As shown, the optical field information coupler provided by Embodiment 2 of the present invention comprises: a beam splitter 1 and a light trap 2. The beam splitter 1 is a quadrangular prism, comprising a beam splitting surface 101, a light beam incident end 102, a light beam exit end 103, a light beam coding end 104 and a light trap end 105. The four surfaces of the beam splitter 1 corresponding to the light beam incident end 102, the light beam exit end 103, the light beam coding end 104 and the light trap end 105 are not perpendicular to the directions of the corresponding light beams, and two adjacent surfaces are not perpendicular to each other. The two surfaces of the beam splitter 1 corresponding to the light beam incident end 102 and the light beam coding end 104 may be parallel or non-parallel, and the two surfaces of the beam splitter 1 corresponding to the light beam exit end 103 and the light trap end 105 may be parallel or non-parallel. Figure 2 The case where two opposite surfaces are parallel is shown in FIG.

[0076] Since the beam incident end 102, the beam exit end 103, the beam coding end 104 and the light trap end 105 of the beam splitter 1 are not perpendicular to the directions of the corresponding light beams, no extinction reflective plate is required at the beam incident end 102, the beam exit end 103, the beam coding end 104 and the light trap end 105 of the beam splitter 1.

[0077] The light beam 401 to be encoded enters the spectrometer 1 from the light beam incident end 102, and is divided into two light beams through the spectrometer surface 101. One light beam is bent to the light trap end 105, and emitted from the light trap end 105 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to perform extinction; the other light beam is emitted from the light beam encoding end 104, and is converted into a coded light beam 402 after being encoded by the light field by the outside world, and is reflected back to the spectrometer 1, bent through the spectrometer surface 101, and emitted from the light beam exit end 103.

[0078] Example 3

[0079] Figure 3 The structure of the light field information coupler according to Embodiment 3 of the present invention is shown.

[0080] like Figure 3 As shown, the light field information coupler provided by Example 3 of the present invention includes: a beam splitter 1 and a light trap 2. The beam splitter 1 is a quadrangular prism, including a beam splitting surface 101, a light beam incident end 102, a light beam exit end 103, a light beam coding end 104 and a light trap end 105. The four surfaces of the beam splitter 1 corresponding to the light beam incident end 102, the light beam exit end 103, the light beam coding end 104 and the light trap end 105 are not perpendicular to the corresponding light beam directions, and two adjacent surfaces are perpendicular to each other.

[0081] Since the beam incident end 102, the beam exit end 103, the beam coding end 104 and the light trap end 105 of the beam splitter 1 are not perpendicular to the directions of the corresponding light beams, no extinction reflective plate is required at the beam incident end 102, the beam exit end 103, the beam coding end 104 and the light trap end 105 of the beam splitter 1.

[0082] The light beam 401 to be encoded enters the spectrometer 1 from the light beam incident end 102, and is divided into two light beams through the spectrometer surface 101. One light beam is bent to the light trap end 105, and emitted from the light trap end 105 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to perform extinction; the other light beam is emitted from the light beam encoding end 104, and is converted into a coded light beam 402 after being encoded by the light field by the outside world, and is reflected back to the spectrometer 1, bent through the spectrometer surface 101, and emitted from the light beam exit end 103.

[0083] Example 4

[0084] Figure 4 The structure of the light field information coupler according to Embodiment 4 of the present invention is shown.

[0085] like Figure 4 As shown, the optical field information coupler provided by Embodiment 4 of the present invention comprises: a beam splitter 1 and a light trap 2. The beam splitter 1 is a quadrangular prism, comprising a beam splitting surface 101, a beam incident end 102, a beam exit end 103, a beam coding end 104 and a light trap end 105. No extinction reflective sheet is provided at the beam incident end 102, the beam exit end 103, the beam coding end 104 and the light trap end 105 of the beam splitter 1. The four surfaces of the beam splitter 1 corresponding to the beam incident end 102, the beam exit end 103, the beam coding end 104 and the light trap end 105 are respectively perpendicular to the corresponding beam directions, and two adjacent surfaces are perpendicular to each other.

[0086] The light beam 401 to be encoded enters the spectrometer 1 from the light beam incident end 102, and is divided into two light beams through the spectrometer surface 101. One light beam is bent to the light trap end 105, and emitted from the light trap end 105 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to perform extinction; the other light beam is emitted from the light beam encoding end 104, and is converted into a coded light beam 402 after being encoded by the light field by the outside world, and is reflected back to the spectrometer 1, bent through the spectrometer surface 101, and emitted from the light beam exit end 103.

[0087] Example 5

[0088] Figure 5 The structure of the light field information coupler according to Embodiment 5 of the present invention is shown.

[0089] like Figure 5As shown, the optical field information coupler provided by Embodiment 5 of the present invention comprises: a beam splitter 1 and a light trap 2. The beam splitter 1 is a triangular prism, comprising a beam splitting surface 101, a beam incident end 102, a beam exit end 103, a beam coding end 104 and a light trap end 105. No extinction reflective sheet is provided at the beam incident end 102, the beam exit end 103, the beam coding end 104 and the light trap end 105 of the beam splitter 1. The two surfaces of the beam splitter 1 corresponding to the beam incident end 102 and the light trap end 105 are respectively perpendicular to the corresponding beam directions.

[0090] The light beam 401 to be encoded enters the spectrometer 1 from the light beam incident end 102, and is divided into two light beams through the spectrometer surface 101. One light beam is bent to the light trap end 105, and emitted from the light trap end 105 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to perform extinction; the other light beam is emitted from the light beam encoding end 104, and is converted into a coded light beam 402 after being encoded by the light field by the outside world, and is reflected back to the spectrometer 1, bent through the spectrometer surface 101, and emitted from the light beam exit end 103.

[0091] Example 6

[0092] Figure 6 The structure of the light field information coupler according to Embodiment 6 of the present invention is shown.

[0093] like Figure 6 As shown, the light field information coupler provided by Example 6 of the present invention includes: a beam splitter 1 and a light trap 2, the beam splitter 1 is a triangular prism, including a beam splitting surface 101, a light beam incident end 102, a light beam exit end 103, a light beam encoding end 104 and a light trap end 105, and the two surfaces of the beam splitter 1 corresponding to the light beam incident end 102 and the light trap end 105 are respectively perpendicular to the corresponding light beam directions.

[0094] A light beam incident end light extinction reflection plate 106 is provided at the light beam incident end 102 , and a light trap end light extinction reflection plate 109 is provided at the light trap end 105 .

[0095] The light beam 401 to be encoded enters the spectrometer 1 from the light beam incident end 102, and is divided into two light beams through the spectrometer surface 101. One light beam is bent to the light trap end 105, and emitted from the light trap end 105 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to perform extinction; the other light beam is emitted from the light beam encoding end 104, and is converted into a coded light beam 402 after being encoded by the light field by the outside world, and is reflected back to the spectrometer 1, bent through the spectrometer surface 101, and emitted from the light beam exit end 103.

[0096] Example 7

[0097] Figure 7 The structure of the light field information coupler according to Embodiment 7 of the present invention is shown.

[0098] like Figure 7 As shown, the optical field information coupler provided by Embodiment 7 of the present invention comprises: a beam splitter 1 and a light trap 2. The beam splitter 1 is a triangular prism, comprising a beam splitting surface 101, a light beam incident end 102, a light beam exit end 103, a light beam encoding end 104 and a light trap end 105. Both surfaces of the beam splitter 1 corresponding to the light beam incident end 102 and the light trap end 105 are not perpendicular to the directions of the corresponding light beams. Therefore, it is not necessary to set an extinction reflector at the light beam incident end 102 and the light trap end 105 of the beam splitter 1.

[0099] The light beam 401 to be encoded enters the spectrometer 1 from the light beam incident end 102, and is divided into two light beams through the spectrometer surface 101. One light beam is bent to the light trap end 105, and emitted from the light trap end 105 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to perform extinction; the other light beam is emitted from the light beam encoding end 104, and is converted into a coded light beam 402 after being encoded by the light field by the outside world, and is reflected back to the spectrometer 1, bent through the spectrometer surface 101, and emitted from the light beam exit end 103.

[0100] Example 8

[0101] Figure 8 The structure of the light field information coupler according to Example 8 of the present invention is shown.

[0102] like Figure 8 As shown, the light field information coupler provided by Example 8 of the present invention includes: a beam splitter 3 and a light trap 2. The beam splitter 3 is a thin film structure, including a light beam incident end 301, a light beam exit end 302, a light beam coding end 303, and a light trap end 304. Extinction reflective plates are provided at the light beam incident end 301, the light beam exit end 302, the light beam coding end 303, and the light trap end 304 of the beam splitter 3.

[0103] The light beam 401 to be encoded enters the beam splitter 3 from the beam incident end 301, and is divided into two light beams through the surface of the beam splitter 3. One light beam is bent to the light trap end 304 and emitted from the light trap end 304 to the light trap 2, and the light trap 2 absorbs the energy of the light beam to extinguish it; the other light beam is emitted from the beam encoding end 303, and is converted into a coded light beam 402 after being encoded by the light field by the outside world and reflected back to the beam splitter 1, and is bent through the surface of the beam splitter 3 and emitted from the beam exit end 302.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0105] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0106] The above specific implementations of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A light field information coupler, comprising: A spectroscopic element and a light trap, the spectroscopic element comprising a spectroscopic surface, a light beam incident end, a light beam exit end, a light beam coding end and a light trap end, the light beam to be coded enters the spectroscopic element from the light beam incident end and is divided into two paths by the spectroscopic surface, one path is emitted from the light trap end after turning to the light trap for extinction, the other path is emitted from the light beam coding end, becomes a coded light beam after light field coding, reflects back to the spectroscopic element, and then is emitted from the light beam exit end after being turned by the spectroscopic surface, the light beam incident end, the light beam coding end, the light trap end and the light beam exit end are The emission ends correspond to the incident direction of the light beam to be encoded, the emission direction of the light beam participating in the encoding, the emission direction of the light beam not participating in the encoding and the emission direction of the encoded light beam respectively; the spectroscopic element is a spectroscopic plate or a spectrometer, and the spectrometer is a quadrangular prism or a triangular prism. When the spectrometer is a quadrangular prism, an extinction reflection plate is respectively arranged at the light beam incident end, the light beam exit end, the light beam encoding end and the light trap end; when the spectrometer is a triangular prism, an extinction reflection plate is respectively arranged at the light beam incident end and the light beam encoding end.

2. The optical field information coupler according to claim 1, characterized in that: The extinction reflective sheet is a wedge-shaped light-transmitting sheet with two surfaces forming a wedge angle θ.

3. The optical field information coupler according to claim 2, characterized in that: The wedge angle of the wedge-shaped light-transmitting sheet is 0<θ≤10°, and the angle formed by the wedge-shaped light-transmitting sheet and the vertical cross section of the corresponding light beam direction is ≤10°.

4. The optical field information coupler according to claim 3, characterized in that: The surfaces of two adjacent wedge-shaped light-transmitting sheets are not perpendicular and the angle formed therebetween deviates from a right angle within ±10°.

5. The optical field information coupler as claimed in claim 3, characterized in that: The surfaces of the two opposing wedge-shaped light-transmitting sheets are not perpendicular and deviate from the parallel plane within ±10°.

6. The optical field information coupler according to claim 1, characterized in that: Among the four surfaces of the beam splitter corresponding to the light beam incident end, the light beam exit end, the light beam encoding end and the light trap end, two adjacent surfaces are perpendicular and / or two opposite surfaces are parallel.

7. The optical field information coupler according to claim 6, characterized in that: The four surfaces are perpendicular or non-perpendicular to the respective corresponding light beam directions.

8. The optical field information coupler according to claim 1, characterized in that: The two surfaces of the beam splitter corresponding to the light beam incident end and the light trap end are perpendicular.

9. The optical field information coupler according to claim 8, characterized in that: The two surfaces are perpendicular or non-perpendicular to the respective corresponding light beam directions.

10. The optical field information coupler according to claim 2, characterized in that: Two adjacent wedge-shaped light-transmitting sheets are arranged with their wedge angles facing a converging direction or a diverging direction.

11. The optical field information coupler according to claim 1, characterized in that: An anti-reflection film is plated on the surface of the extinction reflector.

12. The optical field information coupler according to claim 1, characterized in that: The surface of the quadrangular prism or the triangular prism is not perpendicular to the direction of the light beam, and a reflective film is coated on the surface of the quadrangular prism or the triangular prism.

13. The optical field information coupler according to claim 1, characterized in that: The light beam incident end and the light trap end are located on one side of the light splitting surface, and the light beam exit end and the light beam encoding end are located on the other side of the light splitting surface.

14. The optical field information coupler according to claim 1, characterized in that: The light beam incident end and the light beam encoding end are located on one side of the light splitting surface, and the light beam exit end and the light trap end are located on the other side of the light splitting surface.

15. The optical field information coupler according to claim 1, characterized in that: The light trap is a light absorption layer arranged on one side of the light trap end.

16. The optical field information coupler according to claim 1, characterized in that: The light trap is a light-absorbing coating coated on the surface of the beam splitter corresponding to the light trap end.

17. The optical field information coupler according to claim 1, characterized in that: The light trap is a light absorbing coating coated on the extinction reflective sheet corresponding to the end of the light trap.

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