Saturation effects in the laser ablation of stainless steel in air at atmospheric pressure

被引:25
作者
Cabalín, LM
Romero, D
Baena, JM
Laserna, JJ [1 ]
机构
[1] Univ Malaga, Fac Sci, Dept Analyt Chem, E-29071 Malaga, Spain
[2] Acerinox SA, E-11379 Cadiz, Spain
来源
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY | 1999年 / 365卷 / 05期
关键词
D O I
10.1007/s002160051631
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A pulsed Nd:YAG laser was used to generate a plasma from stainless steel targets in air at atmospheric pressure. Laser focusing was found to be an important factor in the ablation process. The influence of focal conditions on spatial profiles of plasma, emission intensity and averaged ablation rate (AAR, mu m pulse(-1)) of stainless steel samples as a function of laser energy are discussed. At high energies and depending on laser beam focusing, ablation efficiency tends to decrease compared to that at lower energies. This effect can be due to plasma shielding and air breakdown. The averaged ablation rate was found to be dependent on the thickness of the sample. This effect results in shielding of the incoming laser beam and redeposition of removed material in the crater. By focusing the beam inside the material free expansion of plasma is allowed, resulting in more efficient erosion of the sample at larger energies. For comparative purposes, data on ablated mass per pulse are presented.
引用
收藏
页码:404 / 408
页数:5
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