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

• Published in: Chinese science bulletin Vol. 57; no. 21; pp. 2747 - 2751
• Main Authors: Hao, Liang, Liu, ZhanJu, Zheng, ChunYang, Xiang, Jiang, Feng, Wu, Hu, XiaoYan, Li, Bin
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer-Verlag 01.07.2012; SP Science China Press
• Subjects: Chemistry/Food Science; Earth Sciences; Engineering; equations; Humanities and Social Sciences; Life Sciences; multidisciplinary; Physics; Science; Science (multidisciplinary); temperature; 受激布里渊散射; 受激拉曼散射; 对流; 相互作用; 稳定条件; 等离子体密度; 线性理论; 计算结果; stimulated Brillouin scattering; stimulated Raman scattering; three-wave interaction model
• ISSN: 1001-6538; 1861-9541
• DOI: 10.1007/s11434-012-5243-7

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.