Dynamics of femtosecond laser induced ablation from solid surfaces

被引：49
|
作者：
Sokolowski-Tinten, K [1 ]
Bialkowski, J [1 ]
Cavalleri, A [1 ]
Boing, M [1 ]
Schuler, H [1 ]
von der Linde, D [1 ]
机构：
[1] Univ Essen Gesamthsch, Inst Laser & Plasmaphys, D-45117 Essen, Germany
来源：
HIGH-POWER LASER ABLATION, PTS 1-2 | 1998年 / 3343卷
关键词：
ablation; ultrashort laser pulses; time-resolved microscopy;
D O I：
10.1117/12.321593
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Femtosecond laser induced ablation from solid surfaces has been investigated by means of time resolved microscopy. On transparent materials ablation is initiated by dielectric breakdown and formation of a dense and hot surface plasma. Measurements of the plasma threshold yield values of a few times 10(13) W/cm(2) with little variation among different materials. This indicates that microscopic surface properties are responsible for surface breakdown. On absorbing semiconductors and metals near-threshold ablation is brought about by hydrodynamic expansion of the lasergenerated hot and pressurized matter. Upon expansion into vacuum initially metallic materials transform into a transparent state with a high refractive index. The observed behavior is related to general properties of matter in the liquid-gas coexistence regime.
引用
收藏
页码：46 / 57
页数：12
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