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Proceedings Paper

Dynamics of 248-nm laser produced plasmas above a metallic surface
Author(s): Christophe Prat; Thierry Sarnet; Michel L. Autric; Georges Inglesakis
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Paper Abstract

The energy transfer to a metallic sample and the resulting thermal coupling depend strongly on the experimental conditions: incident fluence and intensity, pulse duration, pressure and nature of the surrounding gas. In order to optimize laser-material processing such as surface treatment (ablation, control of roughness, changes of the hardness, residual stresses or surface compounds) the expansion of the produced plasma in front of the surface must be studied. The purpose of this paper is to present an experimental study concerning the characterization of different plasma regimes using an interferometric method and a fast image converter camera. The samples (Ti alloy) have been irradiated from 5 J/cm2 to 130 J/cm2 using a 248 nm laser radiation. The experiments have been performed in various ambient gases (nitrogen, argon, air, and helium) under different ambient pressures (10-3 to 105 Pa). Time-evolved structures (spherical blast wave, LSC, LSD) have been shown depending on the experimental conditions.

Paper Details

Date Published: 31 March 1995
PDF: 5 pages
Proc. SPIE 2502, Gas Flow and Chemical Lasers: Tenth International Symposium, (31 March 1995); doi: 10.1117/12.204888
Show Author Affiliations
Christophe Prat, Institute of Fluid Mechanics (France)
Thierry Sarnet, Institute of Fluid Mechanics (France)
Michel L. Autric, Institute of Fluid Mechanics (France)
Georges Inglesakis, Institute of Fluid Mechanics (France)

Published in SPIE Proceedings Vol. 2502:
Gas Flow and Chemical Lasers: Tenth International Symposium
Willy L. Bohn; Helmut Huegel, Editor(s)

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