Vortex light wavefront distortion correction method based on deep multi-branch compensation network
A technology for compensating network and wavefront distortion, applied in biological neural network models, image analysis, color TV components, etc., can solve the problems of time-consuming vortex light correction technology, high system complexity, and atmospheric turbulence interference, etc., to achieve Improve prediction accuracy, strong robustness, and wide application range
Pending Publication Date: 2022-01-04
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology
[0010] The problem solved by the technology of the present invention is: the development of the current vortex light detection technology is strongly disturbed by atmospheric turbulence, the severe distortion of the vortex light causes crosstalk between adjacent orders of the vortex light, and the beam quality is poor. Therefore, in order to promote the vortex The vortex optical wavefront distortion correction technology is particularly necessary for the field application of the optical rotation detection technology. In order to solve the problems of long time consumption and high system complexity of the vortex optical correction technology, this patent proposes a vortex optical wavefront based on a deep multi-branch compensation network. Distortion Correction Method
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[0044] specific implementation plan
[0045] The present invention takes symmetrical superposition vortex light as the measurement object, and the implementation object is a spatial light modulator. The specific implementation steps are as follows:
[0046] First, a hologram of symmetric superposition vortex light is encoded and loaded onto a phase-only spatial light modulator (SLM). A helium-neon laser (NEWPORT N-LHP-151) emits light at a wavelength of 632.8 nm after being collimated using a linear polarizer (LP), a half-wave plate (HWP) and a telescope consisting of two lenses (L1, L2). Collimated Gaussian beam. The combination of LP and HWP is used to rotate the laser polarization state along the long display axis of the SLM and adjust the power of the incident light on the SLM. The SLM (UPOLABS HDSLM80R) precisely modulates the incident light by loading the aforementioned hologram. The first order diffraction of the beam is then selected using the aperture (AP) to avoid...
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The invention relates to a vortex light wavefront distortion correction method based on a deep multi-branch compensation network. Vortex light is a special light field with a spiral wavefront, and superposition-state vortex light can be generated through self-interference of single-state vortex light in multiple modes. The method is characterized in that a deep multi-branch compensation network is designed, first ten Zernike polynomials are selected to carry out numerical simulation on an atmospheric turbulence phase, and branch learning is carried out on a mapping relation between a vortex light distortion intensity diagram and an atmospheric turbulence phase screen according to a principle that different Zernike polynomials represent different aberration characteristics. In a concept experiment, under various turbulence intensities, once a distorted vortex light intensity distribution diagram is input into a trained network, the network can accurately predict a corresponding atmospheric turbulence compensation screen in an extremely short time; the method can be used for correcting distorted vortex light subjected to phase interference, and the correction effect is good; the method has the advantages of good flexibility, rapidity and robustness, simple operation, and strong generalization ability.
Description
technical field [0001] The invention relates to a vortex optical wavefront distortion correction method based on a deep multi-branch compensation network. Through the branch training network, different types of aberration features of the input distortion intensity distribution map are accurately extracted, and the multi-branch compensation network can learn distortion more accurately. The mapping relationship between the intensity map and the atmospheric turbulence compensation screen. Once a distorted vortex light intensity distribution map is input to the trained network, the network can predict the turbulence compensation screen to correct the vortex light in a very short time. [0002] technical background [0003] The vortex phenomenon in the light field was first discovered by Boivin, Dow and Wolf in 1967 near the focal plane of the lens group. In 1973, Bryngdahl first explored the experimental method of preparing vortex light. In 1979, Vaughan and Willets successfull...
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IPC IPC(8): G06T5/00G06K9/62G06N3/04H04N5/232
CPCG06T5/006G06T2207/20081H04N23/80G06N3/045G06F18/214
Inventor 任元赵杰李修乾孟凡杰刘通刘政良王琛王紫阳
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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