强激光与粒子束2011，Vol.23Issue(3)：593-598,6.DOI:10.3788/HPLPB20112303.0593
Sinc切趾布拉格光栅谱合成特性
Characteristics of spectral beam combining with sinc-apodized Bragg grating
摘要
Abstract
Spectral beam combining technology is an effective approach to obtain high-power laser output. The side-lobe in diffraction efficiency of reflection Bragg grating is the main factor which limits the efficiency of spectral beam combining. In this paper, the theoretical model of spectral beam combining system based on the sinc-apodized Bragg grating is proposed. The diffraction characteristic of the sinc-apodized grating is analyzed by the chain-matrix approach, and the effects of spectral width and beam divergence on combining efficiency are considered. Numerical analysis show that the side-lobe in diffraction efficiency is suppressed well after using the sinc-apodized grating, the peaks of the first side-lobe and second side-lobe are reduced from 62％ and 36％ to 0. 57％ and 0. 12％, respectively. The narrow spectral separation and high efficiency of spectral combining can be achieved after optimizing the sinc-apodized grating's parameters. The number of wavelength channel is increased from 7 to 25 in a total 10 nm bandwidth after using sinc-apodized grating, and the combining efficiency of two beams can be more than 90％ theoretically when the spectral width is less than 0. 15 nm and the angular divergence is less than 0.8 mrad at wavelength of 1 064 nm and 1 064.4 nm.关键词
光栅/谱合成/切趾光栅/sine 切趾/衍射效率/谱合成效率Key words
gratings/ spectral beam combining； apodized grating/ sinc-apodization/ diffraction efficiency； combining efficiency分类
数理科学引用本文复制引用
沈本剑,谭吉春,郑光威,何焰蓝..Sinc切趾布拉格光栅谱合成特性[J].强激光与粒子束,2011,23(3):593-598,6.基金项目
国家自然科学基金委员会与中国工程物理研究院联合基金项目(10676038) （10676038）
