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Femtosecond, picosecond, and nanosecond laser microablation: Laser plasma and crater investigation

Published online by Cambridge University Press:  05 August 2002

A. SEMEROK
Affiliation:
CEA Saclay, DPC/SCPA/LALES, Bât.391, 91191 Gif sur Yvette Cedex, France
B. SALLÉ
Affiliation:
CEA Saclay, DPC/SCPA/LALES, Bât.391, 91191 Gif sur Yvette Cedex, France
J.-F. WAGNER
Affiliation:
CEA Saclay, DPC/SCPA/LALES, Bât.391, 91191 Gif sur Yvette Cedex, France
G. PETITE
Affiliation:
DSM/DRECAM/LSI, Ecole Polytechnique, 91128 Palaiseau Cedex, France

Abstract

Crater shapes and plasma plume expansion in the interaction of sharply focused laser beams (10 μm waist diameter, 60 fs–6 ns pulse duration) with metals in air at atmospheric pressure were studied. Laser ablation efficiencies and rates of plasma expansion were determined. The best ablation efficiency was observed with femtosecond laser pulses. It was found that for nanosecond pulses, the laser beam absorption, its scattering, and its reflection in plasma were the limiting factors for efficient laser ablation and precise material sampling with sharply focused laser beams. The experimental results obtained were analyzed with relation to different theoretical models of laser ablation.

Type
Research Article
Copyright
© 2002 Cambridge University Press

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