A high accuracy and stability thin beam deflection phase control algorithm based on a liquid crystal spatial light modulator
A spatial light modulator, high-stability technology, applied in optics, instruments, computing, etc., can solve the problems of high cost, complex structure, bulky, etc., to reduce the requirements of the adjustment accuracy, improve the stability, and stabilize the deflection angle. Effect
Active Publication Date: 2019-02-19
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Traditional beam deflection technology generally relies on mechanical devices to achieve beam deflection control by changing the direction of the optical axis, which has the disadvantages of complex structure, bulky, expensive, and high energy consumption.
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[0074] 1. Computer simulation to simulate the stability of the symmetrical radial sub-aperture method, and compare it with the existing radial sub-aperture method.
[0075] 1) Set the simulation parameters according to the actual device parameters:
[0076] Modulator pixel width: d=15μm; modulator pixel number: 512×512;
[0077] Incident light wavelength: 730nm; incident light form: fundamental mode Gaussian beam waist / limited circular aperture plane wave;
[0078] Incident light aperture: 3mm; area scanning angle difference: 10μrad;
[0079] Scanning minimum angular interval: 0.5μrad.
[0080] 2) Simulate the dependence of the output angle error and the input alignment error of the radial subaperture method and the symmetrical radial subaperture method respectively. Such as Figure 4~7 shown. Comparing the simulation results of the two algorithms draws several conclusions:
[0081] a. Contrast Figure 4 , Figure 5 It is known that the δ of the radial subaperture meth...
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The invention discloses a novel phase generation method based on a liquid crystal spatial light modulator--a symmetrical radial sub-aperture coherent algorithm, and belongs to the technical field of non-mechanical beam deflection in an active photoelectric system. Aiming at the problem that the alignment error between light source and modulator is easy to affect the stability of scanning point when the original subaperture scanning method realizes the high precision scanning of thin beam, the phase generation method includes that the effective modulation region of the modulator is divided intotwo symmetrical sectors, and the adjacent spacing angles which can be scanned by the traditional variable period phase method are loaded respectively. The other fine angles between the correspondingangles of the final two regions are realized by changing the area proportion of the two symmetrical sectors. At the same time, when the center of the input spot deviates from the center of the modulator panel, the method can make the energy ratio of the beam falling into two regions relatively stable due to the energy compensation effect of the double-sector structure, so as to realize the high stability of the whole scanning spot array. This method can be applied to the center symmetrical beam of any millimeter caliber, and can greatly relax the limitation of the assembly precision of the system without changing the scanning precision of the original radial sub-aperture method, and improve the resistance of the deflection angle to the external mechanical vibration at the same time. This improvement in stability will ultimately enhance the practical value of phased array technology for high-precision beam deflection scanning.
Description
technical field [0001] The invention refers to a phase-loading algorithm using a liquid crystal spatial light modulator to achieve high stability and high-precision beam deflection control—a symmetrical radial sub-aperture coherent algorithm, which belongs to the technical field of non-mechanical beam deflection in active photoelectric control systems. Background technique [0002] Beam deflection technology is widely used in laser radar, laser communication, laser imaging and remote sensing, far-field beam shape control, etc. Traditional beam deflection technology generally relies on mechanical devices to achieve beam deflection control by changing the direction of the optical axis, which has the disadvantages of complex structure, bulky, expensive, and high energy consumption. The new beam deflection technology represented by optical phased array technology realizes the purely electronically controlled deflection of the beam, overcomes many shortcomings of the traditional ...
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IPC IPC(8): G06F17/50G02B27/00
CPCG02B27/0012G06F30/20
Inventor 王启东王承邈穆全全彭增辉刘永刚姚丽双宣丽
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI