Study on multi-channel spectral beam combined characteristics based on volume Bragg gratings

WANG Jun-zhen; WANG Yue-feng; BAI Hui-jun

doi:10.3969/j.issn.1001-3806.2012.05.004

In order to study the combined characteristics of multi-channel spectral beam based on volume Bragg gratings (VBG),after building a model for the spectral combining system of multi-channel laser beam by reflective VBG,the diffraction efficiency curve of different beam spectral width was obtained,and the total combination efficiency curves affected by the absorption coefficient of VBG and the cross-talk between channels were also obtained respectively.Numerical results show that diffraction efficiency decreases with the increase of spectral width of beam under condition that the central frequency of the incident beam remains unchanged;diffraction efficiency decreases after increasing the offset between central frequency of incident beam and the central frequency of VBG;the diffraction efficiency of loss due to the cross-talk between neighboring channels should be considered under the condition that the spectral width of incident beam and the spectral selective width of VBG are approximately equal and the condition that the space between neighboring channels is smaller,with the increase of the combination channels,the effect of the absorption coefficient of the material on total combination efficiency gets larger,but the effect of the cross-talk is almost unchanged.

Study on multi-channel spectral beam combined characteristics based on volume Bragg gratings

Corresponding author: WANG Yue-feng, wyfmail@sina.com;

1. Optics&Electrics Engineering Department, Ordnance Engineering College, Shijiazhuang 050003, China

Received Date: 2012-01-04

Accepted Date: 2012-02-13

Available Online: 2012-09-25

Abstract: In order to study the combined characteristics of multi-channel spectral beam based on volume Bragg gratings (VBG),after building a model for the spectral combining system of multi-channel laser beam by reflective VBG,the diffraction efficiency curve of different beam spectral width was obtained,and the total combination efficiency curves affected by the absorption coefficient of VBG and the cross-talk between channels were also obtained respectively.Numerical results show that diffraction efficiency decreases with the increase of spectral width of beam under condition that the central frequency of the incident beam remains unchanged;diffraction efficiency decreases after increasing the offset between central frequency of incident beam and the central frequency of VBG;the diffraction efficiency of loss due to the cross-talk between neighboring channels should be considered under the condition that the spectral width of incident beam and the spectral selective width of VBG are approximately equal and the condition that the space between neighboring channels is smaller,with the increase of the combination channels,the effect of the absorption coefficient of the material on total combination efficiency gets larger,but the effect of the cross-talk is almost unchanged.

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Reference (12)

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Study on multi-channel spectral beam combined characteristics based on volume Bragg gratings

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