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Liquid crystal spatial light modulator-based radial subaperture phase generation method

A spatial light modulator and sub-aperture technology, applied in optics, instruments, optical components, etc., can solve problems such as the instability of the minimum scanning angle interval value and the serious dependence on the actual deflection angle of the outgoing beam, and achieve the effect of broad application prospects

Inactive Publication Date: 2019-02-15
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Directly using the original horizontal area segmentation technology will make the actual deflection angle of the outgoing beam heavily dependent on the aperture of the incident light, and the achievable minimum scan angle interval value is extremely unstable

Method used

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  • Liquid crystal spatial light modulator-based radial subaperture phase generation method
  • Liquid crystal spatial light modulator-based radial subaperture phase generation method
  • Liquid crystal spatial light modulator-based radial subaperture phase generation method

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Experimental program
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Effect test

Embodiment Construction

[0061] 1. Computer simulation simulation.

[0062] Analog normalized angle θ norm and the occupancy rate of the second area η II The non-linear scan curve between and thus generate the LUT table of the occupancy sequence.

[0063] 1) Set the simulation parameters according to the actual device parameters:

[0064] Modulator pixel width: d=15μm; modulator pixel number: 512×512;

[0065] Incident light wavelength: 730nm; incident light form: fundamental mode Gaussian beam waist / limited circular aperture plane wave;

[0066] The main default parameters mentioned above are changed to other typical parameters during the generality verification simulation of the radial subaperture method.

[0067] Incident light aperture: 2mm / 4mm / 6mm.

[0068] 2) θ in the present invention step It is set to 10μrad according to the specific conditions of the modulator. Select any 10μrad scanning interval within the scanning range, load the phase distribution corresponding to the transverse sub...

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Abstract

The invention discloses a liquid crystal spatial light modulator-based radial subaperture phase generation method and belongs to the technical field of non-mechanical beam deflection in an active photoelectric system. The invention mainly aims to solve the problem of the limited scanning precision of a modulator during beam deflection under a small-aperture beam incidence condition. According to the phase generation method, the effective modulation area of a modulator is divided into two sector-shaped regions, adjacent interval angles that can be scanned by a conventional variable-cycle phasemethod are loaded onto the two regions separately; the proportions of the areas of the two sector-shaped regions can be changed, so that other fine angles between the corresponding angles of the two regions are achieved. The method can be applied to a central-symmetry light beam of any millimeter-scale aperture and can greatly improve the scanning precision of a system without requiring the modification of the hardware condition of the system. According to the method of the invention, a minimum scanning interval angle is compressed from an original ten-micro-arc metric to a sub-micro-arc metric; and the area proportions of the regions are appropriately corrected, so that the scanning interval angle can be substantially stabilized, and the system can realize equal-interval beam scanning ofultra-high sampling density.

Description

technical field [0001] The invention belongs to the technical field of non-mechanical beam deflection in an active photoelectric system, and specifically refers to a novel phase generation algorithm for realizing beam deflection by using a liquid crystal spatial light modulator. Background technique [0002] In an active optoelectronic system, factors such as the range, accuracy, speed, and stability of beam deflection often determine the performance of the entire optoelectronic system. The non-mechanical beam deflection system based on liquid crystal optical phased array technology has programmable control, small size, Light weight, low loss, fast response and other huge advantages, so it has broad application prospects in laser communication, laser radar and other fields. [0003] The liquid crystal spatial light modulator is a typical non-mechanical beam modulation device based on liquid crystal optical phased array technology. Due to the continuous improvement of the ma...

Claims

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Application Information

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IPC IPC(8): G02B27/00
CPCG02B27/0012
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
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