Study of stimulated Raman and Brillouin scattering in a finite interaction region under the convective instability condition
Study of stimulated Raman and Brillouin scattering in a finite interaction region under the convective instability condition
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DOI：
10.1007/s11434-012-5243-7
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发表时间：
2012-07
影响因子：
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通讯作者：
L. Hao;Zhanjun Liu;C. Zheng;J. Xiang;Wu Feng;Xiaoyan Hu;Bin Li
中科院分区：
文献类型：
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作者：
L. Hao;Zhanjun Liu;C. Zheng;J. Xiang;Wu Feng;Xiaoyan Hu;Bin Li
本文采用一维三波相互作用（3WI）模型讨论了对流不稳定条件下的受激拉曼散射（SRS）和受激布里渊散射（SBS）。利用线性理论，我们推导了有限相互作用区域内后向散射波的时间增长率、增益指数和反射率。我们发现，生长速率不仅与激光强度、等离子体密度和温度有关，而且与空间增益有关。相互作用区的长度对增益指数和后向散射水平有重要影响。基于3WI方程模拟了受激拉曼散射和受激布里渊散射的发展和演化。数值结果与线性理论一致。
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.