强激光在磁化等离子体中的调制不稳定性  

Modulational instability of intense laser beam in magnetized plasma

作　　者：陈华英[1][2] 刘三秋[1][2] 李晓卿[3] Hua-ying San-qiu Xiao-qing 

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：《核聚变与等离子体物理》2010年第4期301-305,共5页Nuclear Fusion and Plasma Physics

基　　金：中国科学技术部国际科技合作项目(2009DFA02320);国家自然科学基金(地区)资助项目(10963002)

摘　　要：采用洛伦兹变换推导出左旋椭圆偏振强激光在磁化等离子体中的非线性色散关系,根据Karpman方法推导出激光场包络的非线性控制方程,分析了在磁化等离子体中左旋椭圆偏振激光的调制不稳定性,得到了调制不稳定的时间增长率。分析结果表明,磁化等离子体中自调制不稳定的极大增长率较非磁化情况明显减小,且在激光等离子体临界面附近处调制不稳定性的时间增长率显著增大。The nonlinear dispersion relation is derived for an intense left-hand elliptically polarized laser beam propagating through magnetized plasma by means of the Lorentz transformation.In terms of the Karpman method,the nonlinear governing equation for the envelope of the laser field is obtained.The modulational instability of the intense left-hand elliptically polarized laser beam in magnetized plasma is analyzed and the temporal growth rate of modulational instability is found.The analysis shows that the maximum growth rate of self-modulation instability is obviously smaller for magnetized plasma compared to the unmagnetized case.It is also shown that the temporal growth rate of modulational instability is increased significantly near the critical surface in a laser-plasma.

关 键 词：强激光 磁化等离子体 调制不稳定性 magnetized plasma 时间增长率 椭圆偏振 非线性色散关系 非线性控制方程 激光等离子体 洛伦兹变换 偏振激光 界面附近 分析结果 导出 激光场 非磁化 方法 包络 

分 类 号：O4[理学—物理]