期刊
APPLIED SURFACE SCIENCE
卷 447, 期 -, 页码 388-392出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.04.003
关键词
Femtosecond laser; Nanosecond laser; Al-Mg alloy; Laser ablation; Laser-induced damage threshold; Laser materials processing
类别
资金
- National Natural Science Foundation of China (NSFC) [11404301, 51535003]
- China Postdoctoral Science Foundation [2016M592709]
- Sichuan Postdoctoral Science Foundation
Ablation rates of Al-Mg alloy were studied as a function of laser fluences in air and vacuum. The central wavelength was 800 nm and the pulse duration was 35 fs. Three distinct ablation regimes were identified from the ablation rate curves. Ablation thresholds of 0.16 J/cm(2), and 0.73 J/cm(2) were obtained in the low and moderate laser fluence regimes, respectively. In the case of the third ablation regime, the ablation rate in vacuum is much higher than that in air, which may be due to the oxidation effects and strong defocusing effects associated with the non-equilibrium ionization of air. The damage threshold decreased with the increase of the pulse number, showing an accumulation effect. The fs laser ablated craters showed smooth edges, and laser-induced periodic surface structures (LIPSS) were observed around craters. (C) 2018 Elsevier B.V. All rights reserved.
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