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. [
出处
《计算物理》
CSCD
北大核心
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
