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首页> 外文期刊>Applied Surface Science >Femtosecond laser ablation of Al-Mg alloy in vacuum and air
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Femtosecond laser ablation of Al-Mg alloy in vacuum and air

机译：飞秒激光在真空和空气中烧蚀铝镁合金

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摘要

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.
机译：研究了铝镁合金的烧蚀速率与空气和真空中激光能量密度的关系。中心波长为800 nm，脉冲持续时间为35 fs。从消融速率曲线确定了三种不同的消融方案。在低和中等激光注量范围中分别获得0.16 J / cm（2）和0.73 J / cm（2）的消融阈值。在第三种烧蚀方式的情况下，真空中的烧蚀速率远高于空气中的烧蚀速率，这可能是由于与空气的非平衡电离相关的氧化作用和强烈的散焦作用所致。损伤阈值随着脉冲数的增加而降低，显示出累积效应。 fs激光烧蚀的陨石坑边缘光滑，在陨石坑周围观察到激光诱导的周期性表面结构（LIPSS）。 （C）2018 Elsevier B.V.保留所有权利。

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