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Method for manufacturing multi-wavelength volume bragg gratings

A volume Bragg grating, multi-wavelength technology, used in optical waveguides, optics, cladding fibers, etc., can solve the problems of cumbersome development processing procedures, narrow spectral response range, low photosensitivity, etc. Production cost, effect of simplified recording device

Active Publication Date: 2014-11-05
林安英 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for manufacturing multi-wavelength volume bragg gratings
  • Method for manufacturing multi-wavelength volume bragg gratings
  • Method for manufacturing multi-wavelength volume bragg gratings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Tuning the wavelength of the laser source + recording light reflected from the inner surface of the auxiliary optical plate to make a multi-wavelength VBG

[0025] Such as figure 1 As shown, the light source assembly in this embodiment includes a laser source 11 , an upstream reflector 12 , a beam expander front mirror 13 , a beam expander rear mirror 14 and a downstream reflector 15 . Among them, the ultraviolet laser source 11 adopts a titanium-doped sapphire solid-state laser with nonlinear frequency conversion, and the tunable range of the emission wavelength is 250-300nm; the upstream mirror 12 is a flat mirror, coated with a broadband high-reflection film of ultraviolet light, and the driver changes its The reflection angle of ultraviolet light can control the distance between the laser and the recording component; the beam expander front mirror 13 and the rear mirror 14 respectively have a certain curvature and are coated with ultraviolet broadband high...

Embodiment 2

[0028] Embodiment 2 Rotate the downstream reflector + auxiliary optical plate inner surface to reflect recording light to make multi-wavelength VBG

[0029] Such as image 3 As shown, the light source assembly in this embodiment includes a laser source 21 , an upstream reflector 22 , a beam expander front mirror 23 , a beam expander rear mirror 24 and a downstream reflector 25 . Among them, the ultraviolet laser source 21 adopts a helium-cadmium (He-Cd) laser, and the emission wavelength is 325nm; the upstream reflector 22 is a flat mirror, coated with a 325nm high-reflection film, and the laser and the recording component can be controlled by changing the reflection angle of the ultraviolet light through the driver The distance between the beam expander front mirror 23 and the rear mirror 24 has a certain curvature and is coated with a 325nm high reflection film, forming a beam expander system, which can expand the ultraviolet beam to the required size to achieve uniform expo...

Embodiment 3

[0032] Embodiment 3 Tuning the laser wavelength + total internal reflection recording light on the outer surface of the recording medium to make a multi-wavelength VBG

[0033] Figure 4 It is a schematic diagram of the structure of multi-wavelength VBG produced by tuning the laser wavelength + total internal reflection recording light on the outer surface of the recording medium. The light source assembly in this embodiment is the same as that in Embodiment 1 and will not be described again. The VBG recording assembly includes a trapezoidal prism 36 , a recording medium 37 and fixtures 39 , 40 . The trapezoidal prism 36 is made of glass material transparent to recording light and has the same refractive index as the recording medium. The surface 36A of the trapezoidal prism 36 is optically polished and coated with an anti-reflection coating of 250-300nm; the surface 36C is flat, which facilitates its clamping and fixing. The recording medium 37 adopts a commercial PTR glas...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G03F7/00
Inventor 张小富陈臻懿林安英张玉珂谢仕永张帆商海庆安俊明
Owner 林安英
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