Статья

Surface instability of multipulse laser ablation on a metallic target

L. K. AngIntense Energy Beam Interaction Laboratory, Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104Y. Y. LauIntense Energy Beam Interaction Laboratory, Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104R. M. GilgenbachIntense Energy Beam Interaction Laboratory, Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104Heinz SpindlerIntense Energy Beam Interaction Laboratory, Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104J. S. LashIntense Energy Beam Interaction Laboratory, Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104Scott D. KovaleskiIntense Energy Beam Interaction Laboratory, Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104

1998en

ABI

Аннотация

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/cm2). These surface structures have a wavelength on the order of 30 μm, 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.

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Идентификаторы

DOI: 10.1063/1.367208

Цитирования и источники

Цитирований: 2Использованных источников: 0

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