Pump-probe microscopy of femtosecond laser ablation in air and liquids

被引：14
|
作者：
Kanitz, Alexander [1 ]
Foerster, Daniel J. [2 ]
Hoppius, Jan S. [1 ]
Weber, Rudolf [2 ]
Ostendorf, Andreas [1 ]
Gurevich, Evgeny L. [1 ]
机构：
[1] Ruhr Univ Bochum, Appl Laser Technol, Univ Str 150, D-44801 Bochum, Germany
[2] Univ Stuttgart, Inst Strahlwerkzeuge IFSW, Pfaffenwaldring 43, D-70569 Stuttgart, Germany
来源：
APPLIED SURFACE SCIENCE | 2019年 / 475卷
关键词：
Laser ablation in liquids; Ablation process; Ultrashort laser pulses; Pump-probe microscopy; METAL TARGETS; NANOPARTICLE GENERATION; MOLECULAR-DYNAMICS; ELECTRON; PICOSECOND; MECHANISMS; EXCITATION; SPALLATION; OXIDATION; CATALYSTS;
D O I：
10.1016/j.apsusc.2018.12.184
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The ablation process of femtosecond laser pulses of iron in air and different liquids was investigated for fluences of 0.5 J/cm(2) and 2 J/cm(2) by means of femtosecond pump-probe microscopy. Measurements of the relative change in reflectivity suggest that the surrounding liquid has a significant impact on the ablation process. During the heating phase of the metal within the first picoseconds after laser beam impact, the change in reflectivity in air and liquids is similar. Afterwards, the vapor and melt expulsion in air leads to a strong decrease in reflectivity, while the change in reflectivity in the liquids shows a more complex fluence and time-dependent behavior. This behavior is suggested to be triggered by the expansion of the molten surface and chemical reactions on the picosecond timescale.
引用
收藏
页码：204 / 210
页数：7
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