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Proceedings Paper

Thermal model of phase explosion for high-power laser ablation
Author(s): Quanming Lu; Samuel S. Mao; Xianglei Mao; Richard E. Russo
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Paper Abstract

Although laser ablation of solid materials is finding applications in a growing number of fields, the basic mechanisms underlying laser ablation processes have not been fully understood. One fundamental parameter for high-power laser ablation applications is the ablation depth resulting from the interaction of individual laser pulses. The ablation depth for laser ablation of single-crystal silicon shows a dramatic increase at a laser intensity threshold of approximately 20 GW/cm2. Above this threshold, micron-sized particulates have been observed to eject from the target surface. We present an analysis of this threshold phenomenon and demonstrate that thermal diffusion and subsequent explosive boiling after the completion of laser irradiation is a possible mechanism to describe the observed dramatic increase of the ablation depth. Calculations based on this delayed phase explosion model provide a satisfactory estimate of the measurements. In addition, we find that the shielding of an expanding mass plasma during laser irradiation plays an important role on this threshold phenomenon.

Paper Details

Date Published: 13 September 2002
PDF: 6 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482050
Show Author Affiliations
Quanming Lu, Lawrence Berkeley National Lab. (United States)
Samuel S. Mao, Lawrence Berkeley National Lab. (United States)
Xianglei Mao, Lawrence Berkeley National Lab. (United States)
Richard E. Russo, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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