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Preparation method of a vector compensating volume Bragg grating angle deflector

A technology of volume Bragg grating and vector compensation, which is applied in the direction of diffraction grating, instrument, optics, etc., can solve the problems of deviation of incident beam, decrease of diffraction efficiency of incident beam, mismatch of working wavelength, etc., achieve good angle selectivity and improve diffraction efficiency , the effect of simple method

Active Publication Date: 2022-03-08
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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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.

Method used

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  • Preparation method of a vector compensating volume Bragg grating angle deflector
  • Preparation method of a vector compensating volume Bragg grating angle deflector
  • Preparation method of a vector compensating volume Bragg grating angle deflector

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Embodiment

[0032] In this embodiment, photothermo-refractive (PTR) glass is used as the recording material, and the working wavelength is 1064nm. The angle θ' between the two splints of the designed sample holder splint group is 15°, and the combination with the one-dimensional arc swing table can realize- The angle adjustment range of 15°-45° meets the angle range of the conventional cone angle incident beam of 0°-45°. The cone angle θ of the cone angle incident beam implemented in this embodiment is 20°, so the angle α of the one-dimensional arc swing table is adjusted to 5°. According to the requirements, the incident angle of the grating channel is 0° and the exit angle is 30°. According to the kogelnik coupled wave theory, after determining the incident angle and outgoing angle of the grating channel, the period and tilt angle parameters of the grating channel are calculated. Table 1 gives the channel angle deflection characteristics, structural parameters and vector compensation a...

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Abstract

The invention provides a preparation method of a vector compensating volume Bragg grating angle deflector. The present invention designs a sample holder according to the cone angle of the incident beam, uses the sample holder to expose the sample, uses a muffle furnace to heat-treat the sample after the exposure, polishes the front and rear surfaces of the sample after the heat treatment, and coats the front and rear surfaces of the sample with a 1064nm standard anti-reflection film , made into a vector compensating volumetric Bragg grating angle deflector. The method of the invention can perform vector compensation on the volume Bragg grating recorded in the sample, so that the cone-angle incident beam meets the Bragg condition, can effectively improve the diffraction efficiency of the volume Bragg grating angle deflector for the cone-angle incident beam, and is applied to two-dimensional beam scanning The system can realize high-efficiency beam scanning in two-dimensional directions, has the advantages of simple preparation method and mass production, and has important practical prospects 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18G02B26/10
CPCG02B5/1857G02B26/106
Inventor 晋云霞郝旺邵建达孔钒宇何冬兵孙静赵靖寅莫建威韩昱行
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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