| 基于Fokker-Planck方程的电介质材料短脉冲激光破坏机制分析 |
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| 引用本文： | 陈发良,李东海.基于Fokker-Planck方程的电介质材料短脉冲激光破坏机制分析[J].强激光与粒子束,2011,23(2):334-338. |
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| 作者姓名： | 陈发良 李东海 |
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| 作者单位： | 1. 北京应用物理与计算数学研究所, 北京 100088; 2.中国工程物理研究院 研究生部, 北京 100088 |
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| 基金项目： | 国家高技术发展计划项目，国家973计划项目 |
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| 摘 要： | 基于Pokker-Planck方程,建立一个描述短脉冲激光作用下电介质材料中导带电子能量分布随时间变化的模型,用数值方法计算电子能量分布与电子数密度随时间的演化过程,根据临界等离子体密度准则得到了不同激光脉冲宽度和波长下电介质材料(以SiO<,2>为例)的破坏阈值.结果发现,尽管激光波长通过3种途径对材料破坏阈值的确定...
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| 关 键 词： | 短脉冲激光 Fokker-Planck方程 碰撞电离 光致电离 破坏阈值 |
| 收稿时间： | 1900-01-01; |
Mechanisms of short-pulse laser induced damage in dielectric based on Fokker-Planck equation |
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| Chen Faliang,Li Donghai.Mechanisms of short-pulse laser induced damage in dielectric based on Fokker-Planck equation[J].High Power Laser and Particle Beams,2011,23(2):334-338. |
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| Authors: | Chen Faliang Li Donghai |
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| Institution: | 1.Institute of Applied Physics and Computational Mathematics, P. O. Box 8009-11, Beijing 100088, China; 2.Graduate School of China Academy of Engineering Physics, P. O. Box 2101, Beijing 100088, China |
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| Abstract: | Based on the Fokker-Planck equation,a theoretical computational model is established to describe the change with time of the energy distribution of conduction electrons in a dielectric material under the irradiation of short laser pulses.Using this model,the evolution of electron density in a dielectric material(taking SiO2 glass as an example) is calculated;with the critical plasma density damage criterion,the material damage thresholds are determined for various laser wavelengths and pulse durations.For l... |
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| Keywords: | short-pulse laser Fokker-Planck equation impact ionization photoionization damage threshold |
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