超短强激光脉冲在等离子体隧道中传输的理论与数值模拟研究  

Theoretical and numerical investigation for propagation of ultrashort intense laser pulse in plasma channel

作　　者：唐华[1] 郭弘[1] 刘明伟[1] 仇云利[1] 邓冬梅[1] 

机构地区：[1]华南师范大学传输光学实验室,广州510631

出　　处：《物理学报》2003年第9期2170-2175,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目 (批准号 :6978980 1);国家高技术863计划惯性约束聚变委员会基金;霍英东基金(批准号 :710 5 8);广东省自然科学基金团队项目(批准号 :2 0 0 0 3 0 61);国家教育部骨干青年教师基金资助课题~~

摘　　要：研究了超短强激光脉冲在非扰动抛物型部分电离的预等离子体隧道中的传输特性 .从Maxwell方程出发得到了两个包含衍射、三阶强度非线性、等离子体散焦、等离子体隧道聚焦以及相对论自聚焦等效应在内的激光场演化方程 ,即折射率方程和哈密顿 雅可比方程 .在此基础上得到了激光在等离子体隧道中传输的包络方程以及光斑半径与传输距离。Characteristics of propagation of ultrashort intense laser pulses in a partially stripped pre-formed plasma channel, assumed to be parabolic and unperturbed, are discussed. From Maxwell equations the refractive index equation and Hamilton-Jacobi equation, which describe the evolution of the electric field, are derived including the effects of the diffraction, the third-order intensity-dependent nonlinearity, plasma defocusing, the self-focusing of the plasma channel, and the relativistic self-focusing. The envelope equation of laser propagating in the plasma channel, and the general expression relating the laser spot size with the propagation distance and the width of the plasma channel etc., are derived based on the Hamilton-Jacobi equation and the refractive index equation.

关 键 词：等离子体隧道 等离子体隧道聚焦 相对论自聚焦 势阱 超短强激光脉冲 传输特性 MAXWELL方程 数值模拟 

分 类 号：TN249[电子电信—物理电子学]