辅助光斑对10μm半径级小尺度自聚引发谐波辐射的作用  

EFFECT OF THE SMALL ACCESSARY LASER SPOTS ON THE HARMONIC EMISSION STIMULATED BY SELF-FOCUSING OF A 10-MICROMETER SCALE LASER SPOT

作　　者：林尊琪[1] 章辉煌 何兴法[1] 林康春 王笑琴[1] 庄亦飞[1] 王柳水[1] 韦小春 逯其荣 施阿英[1] 戴美兰[1] 田莉[1] 樊根良[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高功率激光物理联合实验室,上海201800 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》1992年第6期898-909,共12页Acta Physica Sinica

基　　金：国家自然科学基金

摘　　要：本文的最新实验表明,单个10μm半径级的激光斑在预形成的激光等离子体中不能有效激励90°侧向3ω_0/2谐波发射。但配合同样尺寸的辅助光斑,在满足一定位置和角度条件下却容易引发这种发射。使用双等离振子衰变理论,结合动态自聚细丝模型分析了这一现象的起因。A novel group of experiments has shown that single 10-micrometer-radius-scale laser spot is not able to produce the 90° side emitted three half harmonic efficiently in a preformed laser plasmas. However, with the help of one or two accessary laser spots with size similar to the main one, the side emitted three halfs can easily be built up when some position and angle conditions for the accessary spots are fulfilled. The origin of these phenomena have been analyzed in terms of the two plasmon decay theory and dynamic self-focusing model.

关 键 词：辅助光斑 激光等离子体 自聚谐波 

分 类 号：O534[理学—等离子体物理]