激光与固体靶相互作用中低密度预等离子体对高能电子产生的影响  

Influence of a low-density pre-plasma on high energy electrons generation in ultra-short ultra-intense laser-solid interaction

作　　者：银燕[1] 余玮[2] 常文蔚[1] 马燕云[1] 

机构地区：[1]国防科学技术大学理学院应用物理系,湖南长沙410073 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《强激光与粒子束》2004年第1期50-54,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(10085002);国家863计划项目资助课题

摘　　要：　对线极化、圆极化的超短超强激光脉冲与靶前有一段低密度预等离子体的固体靶的相互作用进行了理论和粒子模拟研究。激光通过有质动力加速机制加速预等离子体中的电子,研究了电子获得的最大能量随激光强度和预等离子体密度的变化。当激光脉冲与靶直接作用时,靶中的电子由于J×B机制而得到加速,所获得的能量比预等离子体中电子低。研究表明,在超短超强激光脉冲与固体靶相互作用中,预等离子体的存在有利于高能电子的产生。The interaction between an ultra-short ultra-intense laser pulse and a solid target with a low density pre-plasma was examined. Both linear and circular polarizations of the laser were considered. The electrons in the pre-plasma were accelerated by the ponderomotive force of propagating laser pulse, and the dependences of the maximum electron energy on the laser intensity and the pre-plasma density were examined. The target electrons were accelerated by JXB mechanism, and the maximum energy achieved was much lower than that of the pre-plasma electrons. In this sense, the pre-plasma is advantageous for energetic electrons generation in the ultra-short ultra-intense laser-solid interaction.

关 键 词：超短超强激光脉冲 有质动力加速 预等离子体 高能电子 

分 类 号：TN241[电子电信—物理电子学] O53[理学—等离子体物理]