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Proceedings Paper

Time-resolved investigation of the plasma expansion during picosecond laser material processing
Author(s): G. Urbasch; F. Billmann; Juergen Jandeleit; P. Russbueldt; Hans-Georg Treusch; Ernst-Wolfgang Kreutz
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Paper Abstract

The expansion of the laser induced plasma during material processing of Cu, Au, Si, and Si3N4 with ultrashort laser pulses is investigated using streak photography and high speed photography using delayed 35 ps laser pulses. Pulses of a diode-pumped, modelocked Nd:YAG laser which are amplified by a regenerative amplifier having pulse durations of 35 ps and a maximal energy of 0.1 mJ are used. Experiments are performed using both the fundamental wavelength of 1064 nm and by frequency doubling the wavelength of 532 nm. The onset of plasma formation is during the leading edge of the pulse. The spatial expansion of the plasma corresponds to the self-similar motion of a spherical plane wave in a gas. Independent of the processed material in ambient atmosphere the energy content of the shock wave is about one fifth of the optical energy of the laser pulse.

Paper Details

Date Published: 4 April 1997
PDF: 8 pages
Proc. SPIE 3093, Nonresonant Laser-Matter Interaction (NLMI-9), (4 April 1997); doi: 10.1117/12.271679
Show Author Affiliations
G. Urbasch, Technische Univ. Aachen (Germany)
F. Billmann, Technische Univ. Aachen (Germany)
Juergen Jandeleit, Technische Univ. Aachen (Germany)
P. Russbueldt, Technische Univ. Aachen (Germany)
Hans-Georg Treusch, Fraunhofer Institut fuer Lasertechnik (Germany)
Ernst-Wolfgang Kreutz, Technische Univ. Aachen (Germany)

Published in SPIE Proceedings Vol. 3093:
Nonresonant Laser-Matter Interaction (NLMI-9)
Vitali I. Konov; Mikhail N. Libenson, Editor(s)

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