CN111157109A - Associated vortex recognition device based on equivalent tensor reconstruction method - Google Patents
Associated vortex recognition device based on equivalent tensor reconstruction method Download PDFInfo
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- CN111157109A CN111157109A CN202010026457.5A CN202010026457A CN111157109A CN 111157109 A CN111157109 A CN 111157109A CN 202010026457 A CN202010026457 A CN 202010026457A CN 111157109 A CN111157109 A CN 111157109A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000013528 artificial neural network Methods 0.000 claims abstract description 15
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000012549 training Methods 0.000 claims abstract description 5
- 230000001678 irradiating effect Effects 0.000 claims abstract description 3
- 238000010276 construction Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 7
- 230000001427 coherent effect Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/0228—Control of working procedures; Failure detection; Spectral bandwidth calculation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
- G01J2001/4261—Scan through beam in order to obtain a cross-sectional profile of the beam
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Abstract
The invention discloses an associated vortex identification device based on an equivalent tensor reconstruction method. The implementation steps are as follows: a beam of linearly polarized light generated by a He-Ne laser is used for irradiating the spatial light modulator after beam expansion and phase modulation. The spatial light modulator generates first-order reflected light, the first-order reflected light is selected through a pinhole and then is transmitted to the CCD detector through a density filter to obtain the total light intensity information of the associated vortex. When the helium-neon laser irradiates the spatial light modulator, a computer connected with the spatial light modulator controls and generates information of a light field through a hologram; and calculating the light intensity information of the random light field by using an equivalent tensor reconstruction method, and performing correlation operation on the light intensity information and the total light intensity obtained by the CCD detector to recover the image of the correlation vortex. And inputting the recovered associated vortex image into a depth neural network built in advance for training, so that the depth neural network has the identification capability of the associated vortex, and the accurate identification of the associated vortex is realized.
Description
Technical Field
The invention belongs to the field of optical information, and discloses an associated vortex identification device based on an equivalent tensor reconstruction method.
Background
The uniqueness of the vortex beam is mainly reflected in its particular wavefront structure layout and the determined photon topological charge it carries. The use of the infinity of the topological charge for optical communications can greatly increase the optical communications capacity. In recent years, the generation and detection technology of vortex light beams for optical communication is receiving more and more attention, and the vortex light beams also have wide development prospects in the fields of multiplex communication, quantum secret communication and the like.
In 2003, Bogatyryova et al conducted research on singularity characteristics of partial dry vortex beams, found that a special point with zero amplitude exists in a correlation function, and the phase at the point is subjected to jump and has phase singularity, and confirmed the existence of a vortex structure in an experiment. At almost the same time, Gbur et al propose the concept of "coherent vortex" for vortex beams in a partially coherent optical field and give a definitional description of the phase singularities in the partially coherent field, i.e., the points where the cross-spectral density is zero (both the real and imaginary parts are zero).
The benefit of low coherence is that the associated vortex is less affected when it propagates in turbulence and through obstacles; therefore, it is applied to self-reconstruction in, for example, object recognition and imaging, optical manipulation, obstacle imaging. In quantum optics, the relevant photons can be used to transmit and process information about the relevant physical dimensions. Like quantum beams, partially coherent laser beams also have a degree of freedom in spatial dependence, called spectral coherence, and are embedded in the CSD function. This property allows the correlation of the light field degrees of freedom to be used to perform the imaging task. When encoded with topological charge, information about the structure can also be transmitted through the associated optical beam. In communication, a plurality of information channels are generated and multiplexed, namely, a plurality of transmission modes are propagated in a common channel.
The equivalent tensor reconstruction method can digitally reconstruct partially coherent light in free space. This method is a straightforward reconstruction method without fourier transformation between the spatial and frequency domains. The equivalent tensor reconstruction method can play a great role in long-distance imaging and optical communication. The equivalent tensor reconstruction method has been proposed for calculating the optical field, but due to the limitation of the resolution of the test end, the accurate identification of the associated vortex beam is still a problem which is not realized by the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an associated vortex identification device based on an equivalent tensor reconstruction method. The device provided by the invention can identify the associated vortex light beam after modulation;
the technical scheme for realizing the purpose of the invention is an associated vortex identification device based on an equivalent tensor reconstruction method, which comprises the following steps:
(1) generating a series of digital holograms by a computer, the holograms being operable to generate a superimposed light field, the computer iteratively generating the digital holograms to produce a set of hologram sequences;
(2) the computer is connected with a spatial light modulator; loading the hologram to the spatial light modulator by the computer, and playing the hologram at a determined speed in the form of dynamic frames by the spatial light modulator;
(3) using a helium-neon laser to generate a beam of linear polarized light with stable wavelength, and carrying out beam expansion and phase modulation on the linear polarized light;
(4) the modulated linear polarized light irradiates the spatial light modulator through the light beam splitter; the light rays generate first-order reflected light through a spatial light modulator;
(5) the reflected light passes through the light beam splitter again, is selected through a pinhole and then is transmitted to the CCD detector through a density filter, and the obtained information is the total light intensity information of the associated vortex;
(6) when the helium-neon laser emits linear polarized light and irradiates the spatial light modulator, the computer controls the information of the generated light field through the hologram, and the light intensity information of the random light field is calculated by using an equivalent tensor reconstruction method:
[I]mn＝[Wx]mm·[Wy]nn；
Wx＝Hx TW0xHx,Wy＝Hy TW0yHy；
(m＝1,2,…N1,n＝1,2,…N1)；
wherein [ I]mmRepresenting a random light field intensity discrete matrix calculated by an ETA algorithm; "·" denotes a kind of multiplication operation; wx，WyDiscrete form matrixes of cross-spectral density functions on output planes in the x and y directions respectively; hx，HyIs N1*N1A matrix of (a); w is a0x，w0yAre respectively provided withA discrete form matrix of a cross-spectral density function on an input plane in the x, y directions; superscript T is the transpose operation of the matrix. Performing correlation operation on the light intensity I obtained by calculation and the total light intensity obtained by the CCD detector to recover an image of a correlation vortex;
(7) a computer builds a deep neural network; and (5) repeating the step, inputting a large number of associated vortex images recovered by an equivalent tensor reconstruction method into the deep neural network for training, so that the deep neural network has the identification capability of the associated vortex and realizes accurate identification of the associated vortex.
The invention has the beneficial effects that:
1. the invention provides an associated vortex identification device based on an equivalent tensor reconstruction method. The device provided by the invention is suitable for accurately identifying the associated vortex light beams.
2. The device and the method adopted by the invention are simple and clear in thought.
3. According to the method, the associated vortex image is obtained through an equivalent tensor reconstruction method, the associated function information at the light source can be obtained by directly carrying out equivalent tensor operation on the space signal obtained at the measuring end, and the window effect of coordinate space and angular spectrum space transformation and the precision loss of multiple sampling processes are avoided.
4. The invention achieves the purpose of accurately identifying the associated vortex by training the deep neural network, and the end-to-end intelligent identification method can more simply and accurately extract the phase characteristics of the vortex light beam and eliminate disturbance interference.
Drawings
FIG. 1 is a schematic structural diagram of an associated vortex identification device based on an equivalent tensor reconstruction method in an embodiment of the present invention; fig. 2 is an effect diagram of the relevant vortex identification device based on the equivalent tensor reconstruction method for realizing the relevant vortex identification in the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are illustrative of the present invention and are preferred forms of application of the present invention, but the present invention is not limited to the following examples.
As shown in fig. 1, it is a schematic structural diagram of an associated vortex identification apparatus based on an equivalent tensor reconstruction method according to this embodiment: it includes helium-neon laser 1; a beam expander 2; a light beam splitter 3; a spatial light modulator 4; a first computer 5; a pinhole 6; a density filter 7; a CCD detector 8; a deep neural network 9; a second computer 10;
in this embodiment, the first computer 5 for generating the superimposed-state light field repeatedly generates digital holograms to prepare a group of hologram sequences, and the first computer 5 is connected with the spatial light modulator 4; loading the hologram sequence to a spatial light modulator 4, and playing the hologram sequence at a certain speed in a dynamic frame mode; turning on the He-Ne laser 1 to generate a beam of linear polarized light with stable wavelength, and irradiating the beam into the beam expander 2 for modulation; the modulated linear polarized light irradiates a spatial light modulator 4 through a light beam splitter 3; the light generates first-order reflected light through the spatial light modulator 4; reflected light passes through the light beam splitter 3 again, is selected through a pinhole 6 and then is transmitted to the CCD detector 8 through a density filter 7, and the obtained information is the total light intensity information of the associated vortex; when the He-Ne laser 1 irradiates the spatial light modulator 4, the first computer 5 generates the information of the light field through the control of the hologram, and the light intensity information [ I ] of the random light field is calculated by using an equivalent tensor reconstruction method]mn＝[Wx]mm·[Wy]nnPerforming correlation operation on the total light intensity obtained by the CCD detector 8 to recover an image of a correlation vortex; the second computer 10 builds a deep neural network 9; and inputting a large number of recovered associated vortex images into the deep neural network 9 for training, so that the deep neural network 9 has the accurate identification capability of the associated vortex.
Claims (3)
1. An associated vortex identification device based on an equivalent tensor reconstruction method. The device consists of a helium-neon laser (1), a beam expander (2), a light beam splitter (3), a spatial light modulator (4), a first computer (5), a pinhole (6), a density filter (7), a CCD detector (8), a deep neural network (9) and a second computer (10); the method is characterized in that: a first computer (5) repeatedly generates digital holograms, a group of hologram sequences is prepared, and the hologram sequences are loaded on a spatial light modulator (4) connected with the first computer (5) and played; linear polarized light generated by a helium-neon laser (1) is modulated to irradiate a spatial light modulator (4) through a light beam splitter (3), and the obtained reflected light passes through a density filter (7) after being screened by a pinhole (6), is transmitted to a CCD detector (8) and is received; when the helium-neon laser (1) emits linear polarized light to be transmitted to the spatial light modulator (4), the first computer (5) controls information of a generated light field through a hologram, calculates light intensity information of a random light field by using an equivalent tensor reconstruction method, and performs correlation operation with total light intensity detected by the CCD detector (8) to recover an image of a correlation vortex; the second computer (10) builds a deep neural network (9); repeatedly inputting a large number of successfully recovered associated vortex images into a deep neural network (9) for neural network training until the associated vortices can be accurately identified; the helium-neon laser (1) generates a beam of linear polarized light with stable wavelength, and the beam expansion and phase modulation are needed in the process of irradiating the linear polarized light to the spatial light modulator (4); the construction of the deep neural network (9) is completed by controlling the second computer (10).
2. The device for identifying the associated vortices based on the equivalent tensor reconstruction method according to claim 1, wherein: the hologram sequence is played back by the spatial light modulator (4) in the form of dynamic frames at a defined speed.
3. The device for identifying the associated vortices based on the equivalent tensor reconstruction method according to claim 1, wherein: the first computer (5) controls the generation of a light field through the hologram and simultaneously calculates and restores the associated vortex image through an equivalent tensor reconstruction algorithm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686452A (en) * | 2021-08-25 | 2021-11-23 | 浙江大学 | Detection method of topological value of multi-optical vortex vortex beam based on Shack-Hartman wavefront sensor |
| CN114487628A (en) * | 2022-01-10 | 2022-05-13 | 中国科学院上海光学精密机械研究所 | Detection system and method for topological charge of vortex array based on neural network |
Citations (4)
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| CN105444896A (en) * | 2015-11-30 | 2016-03-30 | 河南科技大学 | Vortex light beam topology charge measuring method based on hexagram hole diffraction |
| WO2017123926A1 (en) * | 2016-01-13 | 2017-07-20 | Nxgen Partners Ip, Llc | System and method for multi-parameter spectroscopy |
| US20180174052A1 (en) * | 2016-12-15 | 2018-06-21 | WaveOne Inc. | Using generative adversarial networks in compression |
| CN108803048A (en) * | 2017-04-28 | 2018-11-13 | 南京理工大学 | A kind of production method and device of tunable spontaneous fission array vortex beams |
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- 2020-01-10 CN CN202010026457.5A patent/CN111157109A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444896A (en) * | 2015-11-30 | 2016-03-30 | 河南科技大学 | Vortex light beam topology charge measuring method based on hexagram hole diffraction |
| WO2017123926A1 (en) * | 2016-01-13 | 2017-07-20 | Nxgen Partners Ip, Llc | System and method for multi-parameter spectroscopy |
| US20180174052A1 (en) * | 2016-12-15 | 2018-06-21 | WaveOne Inc. | Using generative adversarial networks in compression |
| CN108803048A (en) * | 2017-04-28 | 2018-11-13 | 南京理工大学 | A kind of production method and device of tunable spontaneous fission array vortex beams |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686452A (en) * | 2021-08-25 | 2021-11-23 | 浙江大学 | Detection method of topological value of multi-optical vortex vortex beam based on Shack-Hartman wavefront sensor |
| CN113686452B (en) * | 2021-08-25 | 2022-06-14 | 浙江大学 | Multi-optical vortex light beam topological value detection method based on shack Hartmann wavefront sensor |
| CN114487628A (en) * | 2022-01-10 | 2022-05-13 | 中国科学院上海光学精密机械研究所 | Detection system and method for topological charge of vortex array based on neural network |
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