Spatiotemporal Evolution of Stimulated Raman Scattering in the Absolute and Convective Regimes  

作　　者：冯武 李希波 郑春阳 

机构地区：[1]The Graduate School of China Academy of Engineering Physics [2]China University of Mining and Technology (Beijing) [3]Institute of Applied Physics and Computational Mathematics [4]Center for Applied Physics and Technology,Peking University

出　　处：《Plasma Science and Technology》2013年第8期721-726,共6页等离子体科学和技术（英文版）

基　　金：supported by Sci. & Tech.Funds of CAEP(Nos.2010A0102004 and 2010B0102018);National Natural Science Foundation of China(Nos.11075025,10975023,10935003,10835003)

摘　　要：A three-wave interaction （3WI） code is developed to study the stimulated Raman scattering （SRS） in both absolute and convective regimes. In the simulations, the time and spatial evolutions of a plasma wave are described by temporal growth rate and spatial factor, respectively. The spatial factors in different phases and different instability regimes are investigated. It is found that the spatial factor is caused by the finite velocity of the pump wave in the first phase and by damping in the last phase. With inclusion of the spatial factor, the temporal growth rate decreases and the threshold for SRS for a finite frequency mismatch increases. Meanwhile, the effects of wave frequency mismatch on the temporal growth rate are also discussed.A three-wave interaction （3WI） code is developed to study the stimulated Raman scattering （SRS） in both absolute and convective regimes. In the simulations, the time and spatial evolutions of a plasma wave are described by temporal growth rate and spatial factor, respectively. The spatial factors in different phases and different instability regimes are investigated. It is found that the spatial factor is caused by the finite velocity of the pump wave in the first phase and by damping in the last phase. With inclusion of the spatial factor, the temporal growth rate decreases and the threshold for SRS for a finite frequency mismatch increases. Meanwhile, the effects of wave frequency mismatch on the temporal growth rate are also discussed.

关 键 词：SRS absolute and convective instability temporal growth rate spatial factor frequency mismatch 

分 类 号：O437.3[机械工程—光学工程] P315.72[理学—光学]