Dynamic Characteristics of Growing Modes of Raman Instability from Intense Laser Beam Propagating Through Plasma
Dynamic Characteristics of Growing Modes of Raman Instability from Intense Laser Beam Propagating Through Plasma
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DOI：
10.1088/0253-6102/41/4/605
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发表时间：
2004-04
影响因子：
3.1
通讯作者：
Liu Shi-bing;Chen Tao;Chen Shi-gang
中科院分区：
文献类型：
--
作者：
Liu Shi-bing;Chen Tao;Chen Shi-gang
导出了一个基本色散关系，该关系可以描述激光束在等离子体中传播时受激拉曼散射不稳定性的动态特性。通过数值求解这一色散关系，给出了不稳定性的生长方式、角度分布和温度依赖关系的发展。在高激光强度下，电子的温度升高会导致散射光谱的红移。此外，由于散射的上移和下移波的耦合，在有限密度区域出现了一种具有双峰时间结构的调制不稳定性。
An essential dispersion relation, which can describe the dynamic properties of stimulated Raman scattering instability as a laser beam propagates through plasmas, is derived analytically. The development of growth mode, angle distribution, and temperature dependence of the instabilities are presented by solving this dispersion relation numerically. A significant dynamic characteristic has been revealed that the temperature increasing of the electron would result in redshift of scattered spectrum at high laser intensities. Furthermore, a novel modulational instability with double-peak temporal structure appears in a limited density region because of the coupling of scattered upshift and downshift waves.