Compton散射对短脉冲强激光在次临界等离子体中自聚焦的影响  

Influences of Compton scattering on the self-focusing of the intense laser pulse in underdense plasma

作　　者：闫喜亮[1] 郝东山[2] 

机构地区：[1]郑州华信学院教务处,河南新郑451100 [2]郑州华信学院信息工程系,河南新郑451100

出　　处：《光学技术》2014年第1期50-52,共3页Optical Technique

基　　金：河南省基础与前沿技术研究资助项目(2300410227)

摘　　要：应用相对论理论和多光子非线性Compton散射模型,研究了Compton散射对短脉冲强激光在次临界等离子体中自聚焦的影响,提出了将入射光和Compton散射光作为形成激光自聚焦的新机制,给出了三级电流密度满足的修正方程,并进行了数值模拟。结果表明,相对论效应使等离子体中的短脉冲强激光自聚焦趋势减缓,而散射则加速了自聚焦的发展,总自聚焦趋势比无相对论时来得快一些,主要原因是由于散射光和入射光形成的耦合光频率较入射光频率增大,散射效应补偿了因相对论效应引起的自聚焦减缓效应的缘故。Influences of Compton scattering on the self-focusing of the intense laser pulse in underdense plasma are studied using relative theory and the model of multi-photon nonlinear Compton scattering. A new mechanism of the laser self-focusing formed by the incident laser and Compton scattered light is given out. A revised equation on the third degree electric current density is given out. The equation is simulated by using numerical numbers. The results show that the self-focusing direction of the intense laser pulse in plasma is decreased by the relative effect. The self-focusing direction is accelerated by Compton scattering. General self-focusing direction is the faster than the non- relative effect. The key cause is the frequency of the coupling light formed by the incident laser and Compton scattered light is increased than the incident laser frequency. The self-focusing direction effect taken place by the relative effect is compensated by Compton scattering effect.

关 键 词：激光物理 次临界等离子体 激光自聚焦 多光子非线性COMPTON散射 

分 类 号：O532.13[理学—等离子体物理]