Preparation method of vector compensation volume Bragg grating angle deflector

Abstract

The invention provides a preparation method of a vector compensation volume Bragg grating angle deflector. According to the preparation method of the vector compensation volume Bragg grating angle deflector, a sample holder is designed according to the taper angle of an incident light beam; the sample holder is used for exposing a sample; a muffle furnace is used for carrying out heat treatment onthe sample after the sample is subjected to exposure; the front surface and the rear surface of the sample are polished after the sample is subjected to the heat treatment; 1064nm standard antireflection films are plated on the front surface and the rear surface of the sample; and therefore, the vector compensation volume Bragg grating angle deflector is manufactured. According to the method, vector compensation can be carried out on a volume Bragg grating recorded in the sample, so that a cone angle incident light beam meets the Bragg condition, the diffraction efficiency of the volume Bragggrating angle deflector on the cone angle incident light beam can be effectively improved; when the volume Bragg grating angle deflector is applied to a two-dimensional light beam scanning system, high-efficiency two-dimensional direction light beam scanning can be realized. The method has the advantage of simplicity and mass production, and has an important practical prospect in the technical field of two-dimensional laser beam scanning.

Description

technical field [0001] The invention relates to a volume Bragg grating, in particular to a preparation method of a vector compensating volume Bragg grating angle deflector. Background technique [0002] Traditional volume Bragg gratings recorded in photothermographic glass can achieve large-angle beam deflection when the incident beam satisfies the Bragg condition ( figure 1 (a)), and has high diffraction efficiency, low absorption, scattering loss, and high power tolerance. Liquid crystal optical phased array can realize small angle range (typically ±3°~5°), high-precision beam deflection, combined with volume Bragg grating, it can be made into two-dimensional beam scanning system, realizing two-dimensional direction, large angle , Quasi-continuous beam scanning. [0003] For the two-dimensional beam scanning system, it is realized by the scheme of "liquid crystal optical phased array-horizontal deflector Bragg grating-liquid crystal optical phased array-vertical deflecto...

AI Technical Summary

Problems solved by technology

However, when the beam is incident on the vertical deflector Bragg grating after being horizontally deflected, the incident beam and the designed beam incident plane satisfying the Bragg condition ( Figure 4 -YOZ surface) has a cone angle of 0°~45°, which causes the incident beam to deviate from the Bragg incidence condition ( figure 1 (b)), the actual working wavelength does not match the designed working wavelength, which leads to a decrease in the diffraction efficiency of the incident beam by the two-dimensional beam scanning system

At present, no relevant documents or patents have been seen to provide a better solution to this problem.

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