Surface instability of multipulse laser ablation on a metallic target
Surface instability of multipulse laser ablation on a metallic target
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DOI：
10.1063/1.367208
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发表时间：
1998-04-15
影响因子：
3.2
通讯作者：
Kovaleski, SD
中科院分区：
文献类型：
--
作者：
Ang, LK;Lau, YY;Kovaleski, SD
在铝表面被一系列 KrF 激光脉冲（248 nm、40 ns、5 J/cm(2)）烧蚀后，可以在铝表面上观察到大规模的波状图案。这些表面结构的波长约为 30 μm，比激光波长长得多。我们假设这些波型是由熔融铝和等离子体羽流之间界面处的开尔文-亥姆霍兹不稳定性引起的。根据熔融层的厚度以及激光产生的等离子体羽流的空间范围和动能密度进行了参数研究。还包括对多脉冲激光烧蚀实验中累积生长的估计。这些估计表明开尔文-亥姆霍兹不稳定性是形成大规模结构的可行机制。 (C) 1998 年美国物理研究所。
Large scale wavelike patterns are observed on an aluminum surface after it is ablated by a series of KrF laser pulses (248 nm, 40 ns, 5 J/cm(2)). These surface structures have a wavelength on the order of 30 mu m, much longer than the laser wavelength. We postulate that these wave patterns are caused by the Kelvin-Helmholtz instability at the interface between the molten aluminum and the plasma plume. A parametric study is given in terms of the molten layer's thickness and of the spatial extent and kinetic energy density in the laser-produced plasma plume. Also included is an estimate of the cumulative growth in a multipulse laser ablation experiment. These estimates indicate that the Kelvin-Helmholtz instability is a viable mechanism for the formation of the large scale structures. (C) 1998 American Institute of Physics.