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Proceedings Paper

Threshold characteristics of short and ultrashort laser pulse ablation of metals
Author(s): Yuri V. Afanasiev; Nikolai N. Demchenko; Vladimir A. Isakov; Irina N. Zavestovskaia; Boris N. Chichkov
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Paper Abstract

The results of theoretical studies are reported for threshold characteristics of a metal ablation by picosecond and femtosecond laser pulse. Two possible mechanisms of the laser ablation at laser fluence F ≤ Fth are considered: thermal mechanism of ablation connected with a kinetics of a metal-vacuum surface evaporation and the mechanism of ablation connected with a hydrodynamics of a dense matter. The analysis has been made within the framework of a two-temperature model of metals for femtosecond and picosecond region of laser pulse duration and the extended of a two-temperature model of the metal in the case when the surface temperature Ti more than the critical temperature of metals. Analytical expressions for the ablation-threshold fluency Fth as well as the threshold values of the lattice temperature and the characteristic time of lattice temperature decay td(Fth) are obtained. This analytical description is in satisfactory agreement with particular numerical calculations.

Paper Details

Date Published: 13 September 2002
PDF: 8 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482112
Show Author Affiliations
Yuri V. Afanasiev, P.N. Lebedev Physical Institute (Russia)
Nikolai N. Demchenko, P.N. Lebedev Physical Institute (Russia)
Vladimir A. Isakov, P.N. Lebedev Physical Institute (Russia)
Irina N. Zavestovskaia, P.N. Lebedev Physical Institute (Russia)
Boris N. Chichkov, Laser Zentrum Hannover e.V. (Germany)

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

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