非共线多光束布里渊放大横场数值计算方法研究(特邀)  

Research on Numerical Calculation Method of Transverse Field of Non-collinear Multi-beam Brillouin Amplificationn(Invited)

作　　者：崔璨 王月 吕志伟 王雨雷 白振旭 李森森 CUI Can;WANG Yue;LYU Zhiwei;WANG Yulei;BAI Zhenxu;LI Sensen(Center for Advanced Laser Technology,School of Electronics and Information Engineering,Hebei University of Technology,Tianjin,China;Hebei Key Laboratory of Advanced Laser Technology and Equipment,Tianjin,China;National Key Laboratory of Science and Technology on Tunable Laser,School of Astronautics,Harbin Institute of Technology,Harbin,China;Academy of Opto-Electronics,China Electronics Technology Group Corporation(AOE CETC),Tianjin,China)

机构地区：[1]河北工业大学电子信息工程学院先进激光技术研究中心,天津 [2]河北省先进激光技术与装备重点实验室,天津 [3]哈尔滨工业大学航天学院可调谐(气体)激光技术国家重点实验室,哈尔滨 [4]中国电子科技集团公司光电研究院,天津

出　　处：《光电技术应用》2023年第2期15-21,61,共8页Electro-Optic Technology Application

基　　金：国家自然科学基金(61927815);河北省高等学校科学技术研究项目青年基金项目(QN2023173)。

摘　　要：提出了一种非共线多光束布里渊放大横场分布的数值计算方法,采用“微元法”对泵浦光和斯托克斯光场进行单元分割,实现SBS耦合波方程在三维空间上的近似计算。通过理论模拟与实验结果对比,在非共线角度不大于10°的条件下,放大后斯托克斯光斑尺寸和横场强度分布的理论计算结果与实验结果相符。利用该运算模型模拟了斯托克斯光经四束泵浦光边缘放大,实现了圆形向方形光斑、高斯分布向超高斯分布的转化。该计算方法为非共线多光束布里渊放大的光束横场强度分布优化提供了有力的理论研究工具。A numerical calculation method for non-collinear multi-beam Brillouin amplified transverse field distribution is proposed,and the micro-element method is used to divide the pump light and Stokes light field into units,so as to solve the stimulated Brillouin scattering(SBS)coupled wave equation in three-dimensional space.Through the comparison of theoretical simulation and experimental results,under the condition that the non-collinear angle is not greater than 10°,the theoretical calculation results of the amplified Stokes spot size and transverse field intensity distribution are consistent with the experimental results.The calculation model is used to simulate the edge amplification of Stokes light by four beams of pump light,and realize the transformation from circular to square spot and from Gaussian distribution to super-Gaussian distribution.This calculation method provides a powerful theoretical research tool for the optimization of beam transverse field intensity distribution of non-collinear multi-beam Brillouin amplification.

关 键 词：布里渊放大 横场分布 非共线多光束 

分 类 号：TN249[电子电信—物理电子学]