Method for manufacturing multi-wavelength volume bragg gratings

Abstract

The invention relates to a method for manufacturing multi-wavelength VBGs. The method particularly includes the steps that an ultraviolet light passes through a trapezoid prism to irradiate photosensitive dielectric PTR glass; incoming recording light is reflected through an auxiliary optical flat or the PTR glass, the reflected recording light and the incoming recording light are intervened in the PTR glass to form standing waves; the wavelength of a tuning laser source or a rotary laser reflection element enables the incoming angle of the recording light to be changed, and exposure in different periods is achieved; heat processing and cutting are carried out on the PTR glass obtained after exposure, and the multi-wavelength VBGs are finally obtained. The method for manufacturing the multi-wavelength VBGs is concise and practical, continuous tuning of the VBG working wavelength can be achieved under the condition that a recording device is kept unchanged; the clear aperture of the manufactured VBGs is not limited by sample absorption or other kinds of performance of materials; incoming of only one beam of recording light is needed, so that the recoding device is greatly simplified, and the large-amount efficient manufacturing of the VBGs is facilitated.

Description

technical field [0001] The invention relates to a method for fabricating a multi-wavelength volume Bragg grating, in particular to a method for fabricating a multi-wavelength volume Bragg grating with multiple spectral reflection peaks in photothermorefractive glass by tuning the recording light wavelength or changing the incident angle of the recording light. Background technique [0002] Volume Bragg grating (VBG) as a filter element is selective to the wavelength of incident light and can be used to improve the emission spectrum of light (such as the peak wavelength and spectral width of laser emission) [B.L.Volodin, S.V.Dolgy, E.D.Melnik, E.Downs, J. Shaw, and V.S. Ban, "Wavelength stabilization and spectrum narrowing of high-power multimode laser diodes and arrays by use of volume Bragg gratings", Optics Letters, 29: 1891 (2004); T. Chung, A. Rapaport, et al. al, "Solid-state laser spectral narrowing using a volumetric photothermal refractive Bragg grating cavity mirror...

AI Technical Summary

Problems solved by technology

Among them, the silver halide photosensitive material has high sensitivity, but the diffraction efficiency is low, and the processing and development procedures are cumbersome.

The hologram made of dichromate gelatin has a high diffraction efficiency, which can reach more than 90%, but the photosensitivity is low and the spectral response range is narrow

In addition, the hologram made of this material is greatly affected by the environment, and it is easy to disappear at high temperature

Photopolymer materials can overcome some of the shortcomings of the above materials, but the disadvantage is that the material is greatly affected by the environment (temperature, humidity), and the latex has shrinkage and expansion, and the performance needs to be further improved

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