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Proceedings Paper

Laser-induced damages on IR windows and detector materials
Author(s): Bernard Gautier; Jean-Pierre Moeglin
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Paper Abstract

An experimental study of the damages induced by laser irradiation by different materials used as well as IR optics (germanium) or detector bulk materials (silicon) has been performed. The irradiation source is a repetitively pulsed Nd:YAG laser operating in fundamental mode ((lambda) equals 1.06 micrometers ) and single pulse selection. Instantaneous output power densities of 6 X 103 to 5 X 105 W/cm2 and pulse durations of 1 to 20 ms have been achieved. Different types of damages have been observed, depending on laser power density and spot size: mechanical fractures along privileged directions, ripples formation and principally surface protuberance rise as a sharp tipped peak during the melting pool resolidification when the laser is turned off. Emphasis is placed on the study of this last effect. We measure the final height of the resolidification peak and correlate it with target material and irradiation parameters. A numerical model of laser-material interaction including the density variation between the different phases has been used to correlate the experimental results. Qualitative agreement has been demonstrated for the surface growth time history.

Paper Details

Date Published: 31 March 1995
PDF: 7 pages
Proc. SPIE 2502, Gas Flow and Chemical Lasers: Tenth International Symposium, (31 March 1995); doi: 10.1117/12.204895
Show Author Affiliations
Bernard Gautier, Deutsch-Franzoesisches Forschungsinstitut (France)
Jean-Pierre Moeglin, Deutsch-Franzoesisches Forschungsinstitut (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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