Numerical modeling of the transmission of breakdown plasma generated in water during laser shock processing
Numerical modeling of the transmission of breakdown plasma generated in water during laser shock processing
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DOI：
10.1051/epjap:2001202
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发表时间：
2001-11
影响因子：
1
通讯作者：
A. Sollier;L. Berthe;R. Fabbro
中科院分区：
文献类型：
--
作者：
A. Sollier;L. Berthe;R. Fabbro
从理论上研究了激光冲击强化过程中水中击穿等离子体的传输特性。基于速率方程形式主义的数值模型已经被开发来计算通过水中产生的击穿等离子体传输的激光脉冲的特性（峰值辐照度和持续时间）。所得结果与25 ns-1064 nm激光脉冲的实验数据符合得很好。在10 GW/cm 2以上，透射峰值辐照度饱和，透射率开始降低。结果已经扩展到更短的波长（532和355 nm）。在1064 nm处，击穿过程由雪崩电离主导，而对于较短的波长，多光子电离起主要作用。
The transmission of breakdown plasma generated in water during laser shock processing experiments was investigated theoretically. A numerical model based on a rate equation formalism has been developed to calculate the characteristics (peak irradiance and duration) of the laser pulses transmitted through the breakdown plasmas generated in water. Results are in good agreement with previous experimental data for 25 ns--1064 nm laser pulses. Above 10 GW/cm 2 , the transmitted peak irradiance saturates and the transmission starts to decrease. The results have been extended to shorter wavelengths (532 and 355 nm). At 1064 nm, the breakdown process is dominated by avalanche ionization, whereas for shorter wavelengths, multiphoton ionization plays the major role.