激光等离子体相互作用中的受激布里渊散射

本文的研究表明,在亚毫微秒脉宽的高强度激光等离子体相互作用中,如入射激光包含有明显的预脉冲,则能从激光的后向反射率的剧增、后向反激光光谱的红移并加宽、离子总动能与快离子发射的明显减少以及大角度散射激光的增强等方面,自洽地证实受激布里渊散射的发生。 关键词：

STIMULATED BRILLOUIN SCATTERING DUE TO LASER-PLASMA INTERACTIONS

Our investigation indicates that if the incident laser contains distinct pre-pulse, the occurrence of stimulated Brillouin scattering under the interaction of high intensity sub-ns pulse laser with plasmas can be self-consistently confirmed. The evidences include an anomalous increase of the fraction of incident laser energy which is backscattered into the focusing lens, the red shift and broadening of spectrum of back-reflected laser, the dramatic reduction of total ion energy and fast ion emission, the enhancement of sidescattered laser light at large scattering angles and so on.