强激光加载真空中铝靶冲量耦合的数值模拟  

Numerical simulation of impulse coupling to aluminum in laser ablation in vacuum

作　　者：袁红[1] 童慧峰[1] 李牧[1] 孙承纬[1] 

机构地区：[1]中国工程物理研究院流体物理研究所

出　　处：《激光技术》2012年第4期520-523,共4页Laser Technology

基　　金：国家自然科学基金青年科学基金资助项目(11002132)

摘　　要：为了获得强激光加载真空中铝靶的冲量耦合系数，利用激光体烧蚀模型，采用流体力学理论和1维Lagrange有限差分的计算方法，对真空条件下不同激光参量时气化物质对靶产生冲量的过程进行了数值模拟，模拟计算结果与实验测量结果、Phipps定标关系符合得较好。结果表明，在等离子体条件下，冲量耦合系数随着激光功率密度的增大而减小。In order to obtain the mechanical coupling coefficients, a 1-D bulk absorption model to simulate the solid target ablated directly by the laser beam was presented, numerical calculation of impulse acting on the target in vacuum with different laser parameters was performed with fluid dynamics theory and 1-D Lagrange finite difference scheme. The calculated results of the impulse coupling coefficients are in good agreement with the experimental results and Phipps empirical value. The simulated results show that the mechanical coupling coefficients decrease with the increment of laser intensity when the laser pulses generate plasma.

关 键 词：激光技术 激光烧蚀 冲量耦合 数值模拟 等离子体 

分 类 号：TN241[电子电信—物理电子学]