Study of stimulated Raman and Brillouin scattering in a finite interaction region under the convective instability condition  

作　　者：HAO Liang LIU ZhanJu ZHENG ChunYang XIANG Jiang FENG Wu HU XiaoYan LI Bin 

机构地区：[1]Institute of Applied Physics and Computational Mathematics,Beijing 100094,China [2]Center for Applied Physics and Technology,Peking University,Beijing 100871,China [3]Graduate School of China Academy of Engineering Physics,Beijing 100088,China

出　　处：《Chinese Science Bulletin》2012年第21期2747-2751,共5页

基　　金：supported by Science and Technology Funds of CAEP(2010B0102018and2010A0102004);the National Natural Science Foundation of China(11147141,11175029,11075025,10975023,10935003)

摘　　要：We discuss stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) under the convective instability condition with a one-dimensional three-wave interaction (3WI) model.Using linear theory,we deduce the temporal growth rate,gain exponent,and reflectivity of the backward scattered wave in a finite interaction region.We find that the growth rate is not only determined by the laser intensity and plasma density and temperature,but also related to the spatial gain.The length of the interaction region is important to the gain exponent and backscattering level.We simulate the developments and evolutions of SRS and SBS based on the 3WI equations.Our numerical results consist with the linear theory.We discuss stimulated Raman scattering （SRS） and stimulated Brillouin scattering （SBS） under the convective instability condition with a one-dimensional three-wave interaction （3WI） model.Using linear theory,we deduce the temporal growth rate,gain exponent,and reflectivity of the backward scattered wave in a finite interaction region.We find that the growth rate is not only determined by the laser intensity and plasma density and temperature,but also related to the spatial gain.The length of the interaction region is important to the gain exponent and backscattering level.We simulate the developments and evolutions of SRS and SBS based on the 3WI equations.Our numerical results consist with the linear theory.

关 键 词：受激拉曼散射 稳定条件 对流 受激布里渊散射 等离子体密度 线性理论 相互作用 计算结果 

分 类 号：O437[机械工程—光学工程]