Subpicosecond laser ablation of copper and fused silica: Initiation threshold and plasma expansion
Subpicosecond laser ablation of copper and fused silica: Initiation threshold and plasma expansion
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DOI：
10.1016/j.apsusc.2009.04.060
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发表时间：
2009-09-30
影响因子：
6.7
通讯作者：
Mihailescu, I. N.
中科院分区：
文献类型：
--
作者：
Axente, E.;Noel, S.;Mihailescu, I. N.
利用快速羽流成像和时空分辨光学发射光谱技术，研究了在真空条件下，100ps、800 nm激光辐照下，铜和熔融二氧化硅的亚皮秒激光烧蚀过程。我们发现，与铜烧蚀的不同之处在于，熔融二氧化硅靶产生的激光等离子体只有一个主要成分。在铜烧蚀过程中观察到的、通常被归因于纳米颗粒光发射的“慢”等离子体成分，即使在熔融二氧化硅靶被提交到我们实验中使用的最高入射通量的情况下，也没有被等离子体快速成像或光学发射光谱检测到。这一独特成分的特征膨胀速度大约是铜烧蚀过程中观察到的快速羽流成分的速度的三倍。从烧蚀效率和引发机理两个方面对激光通量与等离子体膨胀和烧蚀速率的关系进行了研究和讨论。(C)2009爱思唯尔B.V.保留所有权利。
We investigated the subpicosecond laser ablation of copper and fused silica under 100 fs laser irradiation at 800 nm in vacuum by means of fast plume imaging and time- and space-resolved optical emission spectroscopy. We found that, to the difference of copper ablation, the laser-generated plasma from a fused silica target exhibited one "main'' component only. The "slow'' plasma component, observed during copper ablation and usually assigned to optical emission from nanoparticles was not detected by either plasma fast imaging or optical emission spectroscopy even when fused silica targets were submitted to the highest incident fluences used in our experiments. The characteristic expansion velocity of this unique component was about three times larger than the velocity of the fast plume component observed during copper ablation. The dependence of laser fluence on both plasma expansion and ablation rate was investigated and discussed in terms of ablation efficiency and initiation mechanisms. (C) 2009 Elsevier B.V. All rights reserved.