在稀薄等离子体中激光传播的相对论自聚焦  

RELATIVISTIC SELF-FOCUSING OF LASER PROPAGATIONIN UNDERDENSE PLASMA

作　　者：于立春[1] 屠琴芬[1] 余玮 陈志华[1] 韩学安[1] 

机构地区：[1]西北核技术研究所,陕西西安710024 [2]上海光机所,上海201800

出　　处：《计算物理》2001年第5期457-462,共6页Chinese Journal of Computational Physics

基　　金：国家 8 63高技术惯性约束聚变 ( 863 416 1)资助项目

摘　　要：讨论超强、超短脉冲激光在稀薄等离子体中传播过程的某些性质 ;用二维快速傅立叶变换求解波动方程 .相对论自聚焦的基本方程包括非线性源项和衍射的影响 .由于有质动力和相对论的影响 ,使等离子体的频率降低 ,从而使折射指数发生改变 ,影响激光在等离子体中的传播 .在入射激光功率 (p)超过临界功率 (pc)时 ,激光在传播过程中产生自聚焦 ;反之 ,激光在传播过程中逐渐衰减 ,不产生自聚焦 .Some natures have been studied for the propagation process of very intense and very short laser pulse in underdense plasma.The wave equation is derived and solved using the method of 2-D Fast Fourier Transformation.The basic equations for relativistic self-focusing include the nonlinear source term and the effect of diffraction.As a result of ponderomotive forces and relativism,the plasma frequency is reduced and so the refractive index is changed.It affects the propagation of laser in plasma.When the incident laser power(p) exceeds the critical power (p c),self-focusing appears during the propagation of laser.On the contrary,laser damps gradually and self-focusing doesn't appear. [

关 键 词：激光 等离子体 相对论 数值模拟 自聚焦 传播 波动方程 

分 类 号：TN012[电子电信—物理电子学] O534[理学—等离子体物理]