| 在稀薄等离子体中激光传播的相对论自聚焦 |
| |
| 引用本文： | 于立春,屠琴芬,余玮,陈志华,韩学安.在稀薄等离子体中激光传播的相对论自聚焦[J].计算物理,2001,18(5):457-462. |
| |
| 作者姓名： | 于立春 屠琴芬 余玮 陈志华 韩学安 |
| |
| 作者单位： | 1. 西北核技术研究所, 陕西 西安 710024;2. 上海光机所, 上海 201800 |
| |
| 基金项目： | 国家863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.
|
| 关 键 词： | 激光 等离子体 相对论 成丝 数值模拟 |
| 文章编号： | 1001-246X(2001)05-0457-06 |
| 收稿时间： | 2000-11-21 |
| 修稿时间： | 2000年11月21 |
RELATIVISTIC SELF-FOCUSING OF LASER PROPAGATION IN UNDERDENSE PLASMA |
| |
| YU Li-chun,TU Qin-fen,YU Wei,CHEN Zhi-hua,HAN Xue-an.RELATIVISTIC SELF-FOCUSING OF LASER PROPAGATION IN UNDERDENSE PLASMA[J].Chinese Journal of Computational Physics,2001,18(5):457-462. |
| |
| Authors: | YU Li-chun TU Qin-fen YU Wei CHEN Zhi-hua HAN Xue-an |
| |
| Institution: | 1. Northwest Institute of Nuclear Technology, Xi'an 710024, P R China;2. Shanghai Institute of Optics and Fin Mechanics, Shanghai 201800, P R China |
| |
| Abstract: | 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 (pc),self-focusing appears during the propagation of laser.On the contrary,laser damps gradually and self-focusing doesn't appear. |
| |
| Keywords: | laser plasmas relativism filamentation numerical simulation |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《计算物理》浏览原始摘要信息 |
| 点击此处可从《计算物理》下载免费的PDF全文 |
|
