强激光脉冲在部分离化等离子体中的传播特性  

Propagation properties of an intense laser pulse in partially stripped plasma

作　　者：刘明萍[1] 柳剑鹏 罗荣祥[3] 陶向阳[2] 

机构地区：[1]南昌大学信息工程学院,南昌330031 [2]江西师范大学物理与通信电子学院,南昌330022 [3]南昌大学物理系,南昌330031

出　　处：《强激光与粒子束》2014年第7期75-79,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11147005);江西省自然科学基金项目(20122BAB202003)

摘　　要：采用变分法给出了强激光脉冲在部分离化等离子体中传播的参数演化方程,其中考虑了相对论自聚焦、有质动力激发尾波场以及部分离化非线性极化强度的影响。通过非线性动力学分析的方法,得到了强激光脉冲以恒定焦斑半径传播时的激光、等离子体参数匹配条件。研究表明:在部分离化等离子体中,激光自聚焦随着电离程度的增大而增强;有质动力激发的尾波场进一步增强激光脉冲的自聚焦;相对于等离子体密度而言,激光强度对激光脉冲的自聚焦更有影响。In the presence of relativistic,wakefield driven by the ponderomotive force and nonlinear polarization effects,the propagation characteristics of an intense short laser pulse in a partially stripped plasma are investigated.The evolution equation of the laser spot size is derived using variational technique.The matched parameters of laser and plasma for propagation with constant spot size are identified using the nonlinear dynamics.It is found that the laser focusing is enhanced in partially stripped plasma as compared to fully ionized plasma and also by the wakefield effects.The laser intensity for focusing dominates over the plasma density in partially stripped plasma.The results may be significant theoretically to the mechanism of ionization-induced injection and acceleration by an intense short laser.

关 键 词：电离诱导注入 激光传播 电子尾波场加速 部分离化等离子体 

分 类 号：O437[机械工程—光学工程]