线偏振激光在磁化等离子体中的调制不稳定性  

Modulation instability of linearly polarized laser beam in magnetized plasma

作　　者：陈华英[1,2] 刘三秋[1,2] 李晓卿[3] 

机构地区：[1]南昌大学材料学院,南昌330031 [2]南昌大学理学院,南昌330031 [3]南京师范大学物理系,南京210097

出　　处：《强激光与粒子束》2008年第12期2022-2026,共5页High Power Laser and Particle Beams

基　　金：新世纪优秀人才支持计划资助课题(NCET-05-0575);江西省跨世纪学术和技术带头人培养计划项目(040010);江西省科技攻关计划项目(20061B0402100)

摘　　要：采用洛伦兹变换推导了线性偏振激光在磁化等离子体中的非线性色散关系,根据Karpman方法推导出横波的非线性控制方程,利用线性偏振激光在磁化等离子体中的非线性色散关系和非线性控制性方程,分析了在磁化等离子体中有限振幅的扰动引起的调制不稳定性,得到了线性偏振激光的调制不稳定的时间增长率与扰动波数之间的函数关系。分析结果表明:激光等离子体的临界面附近的磁调制不稳定性的时间增长率显著增大。The nonlinear dispersion relation of a linearly polarized laser beam in magnetized plasma was derived using the Lorentz transform, in which the nonlinearity of the relativistic factor was taken into account. In terms of Karpman method, the nonlinear governing equation for the amplitude of the linearly polarized laser field was obtained theoretically. Thus, the modula- tional instability of this intense laser beam in magnetized plasma was analyzed and the temporal growth rate for the finite amplitude of the perturbed field was found analytically. It is shown that the growth rate of magnetic modulation instability increases signifi- cantly in the corona region near the critical surface in laser-produced plasma.

关 键 词：线性偏振激光 调制不稳定性 非线性色散关系 非线性控制性方程 磁化等离子体 时间增长率 

分 类 号：O534[理学—等离子体物理]