Optical breakdown threshold in fused silica with femtosecond laser pulses

被引:12
|
作者
Bendib, A. [1 ]
Bendib-Kalache, K. [1 ]
Deutsch, C. [2 ]
机构
[1] USTHB, Fac Phys, Quantum Elect Lab, Algiers 16111, Algeria
[2] Univ Paris 11, Phys Gaz & Plasmas Lab, UMR 8578, F-91405 Orsay, France
关键词
Dielectrics; Optical breakdown; Ultra-short laser pulse; ULTRAFAST ELECTRON DYNAMICS; DIELECTRICS; DAMAGE; NANOSECOND; IONIZATION; FIELD;
D O I
10.1017/S0263034613000396
中图分类号
O59 [应用物理学];
学科分类号
摘要
A theoretical model for electrons in the conduction band intend to investigate the optical breakdown threshold in femtosecond laser pulse-fused silica interaction is presented. The model is derived from a rate equation that includes the avalanche and multi-photon ionization processes of Thornber and Keldysh, respectively, and also the three-body and exciton recombination mechanisms. In addition, the time evolution of electron mean energy is also considered through the energy balance equation. The mean energy acts as a trigger for the avalanche mechanism. The evolution of electron density profiles is calculated and discussed with respect to the ionization and recombination mechanisms. The results for the fluence threshold as a function of the pulse duration fall in good agreement with the experimental data reported in the literature.
引用
收藏
页码:523 / 529
页数:7
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