10μm数量级小尺度激光斑在等离子体中的自聚焦和谐波发射效应  

SELF-FOCUSING AND HARMONIC EMISSION EFFECT INDU-CED BY TEN-MICRON-SMALL-SCALE LASER SPOT IN PLASMAS

作　　者：林尊琪[1] 何兴法[1] 章辉煌 王笑琴[1] 庄亦飞[1] 林康春 赵志文 韦小春 施阿英[1] 田莉[1] 戴美兰[1] 沈小华[1] 李家明[2] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》1991年第2期234-242,共9页Acta Physica Sinica

基　　金：国家自然科学基金

摘　　要：本文报道10μm半径数量级单个激光斑在预形成等离子体中造成的侧向3ω_0/2谐波时空分辨特性。详细讨论了该数量级激光斑小尺度自聚成丝与3ω_0/2谐波辐射的紧密关联性。提出在低到0.05n_c低密度等离子体区域出现的侧向谐波信号可能由自聚引发的Langmuir波或离子声波散射构成。We present in this paper the temporally and spatially resolved feature of the side scattered 3ω_o/2 harmonic emission, induced by A single laser spot with ten-micron-radius-scale in a preformed laser plasma. The close relation of the harmonic emission with such a small scale laser self-focusing filamentation has been discussed in detail. It is suggested that the side scattered harmonic signal from a underdense region as low as 0.05nc may be caused by the Lang-muir wave and/or ion-acoustic wave scattering induced by laser dynamic filamentation.

关 键 词：激光斑 等离子体 自聚焦 

分 类 号：O532.25[理学—等离子体物理]