Mechanisms of femtosecond laser-induced damage in magnesium fluoride

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• 作者：Haiyi Sun ; Tianqing Jia ; Chengbin Li ; Xiaoxi Li ; Shizhen Xu ; Donghai Feng ; Xiaofeng Wang ; Xiaochun Ge ; Zhizhan Xu
• 关键词：A. Magnesium fluoride ; D. Damage mechanisms ; E. Femtosecond laser ; E. Pump– ; probe measurements
• 刊名：Solid State Communications
• 出版年：2007
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：January 2007
• 卷：141
• 期：3
• 页码：127-131
• 文件大小：777 K

摘要

We studied the single-shot damage in magnesium fluoride irradiated by 800 nm femtosecond (fs) laser. The dependence of damage thresholds on the laser pulse durations from 60 to 750 fs was measured. The pump–probe measurements were carried out to investigate the time-resolved electronic excitation processes. A coupled dynamic model was applied to study the microprocesses in the interaction between fs laser and magnesium fluoride. The results indicate that both multiphoton ionization and avalanche ionization play important roles in the femtosecond laser-induced damage in MgF₂.