小能量激光等离子体的受激Raman散射

STIMULATED RAMAN SCATTERING IN PLASMAS PRODUCED BY LOW ENERGY LASER

研究了激光平面靶耦合时受激Ｒａｍａｎ散射（ＳＲＳ）的时间分辨光谱．在小能量激光入射平面靶时，ＳＲＳ主要受激光等离子体电子密度分布的影响．在激光靶耦合初期，等离子体电子密度呈指数分布，ＳＲＳ因对流阈值较高而被抑制，耦合后期平面靶被烧穿后，等离子体电子密度呈高斯分布，ＳＲＳ就在均匀密度处绝对增长起来．多种材料构成的靶以及成丝存在，加剧了等离子体电子密度平台的出现。

Abstract The result of experimental studies of stimulated Raman scattering (SRS) was report in this paper. When the disk target was irradiated by low energy laser, the plasma density scale length was short, and the SRS threshold intensity was very high, SRS only occurred in those local ranges where electron density was homogeneous. Multi material targets and filamentation will produce more those local range, these will increase SRS light