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Proceedings Paper

Study of laser-induced damage at 2 microns on coated and uncoated ZnSe substrates
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Paper Abstract

Laser damage characteristics of infrared substrates and coatings at 2-micron wavelength have been rarely studied until yet, even if the need of optical components with high laser-induced damage threshold in the mid-infrared is important. Use of an infrared nanosecond laser, tunable in the range 2 to 5 microns, allowed us to develop an automatic test facility for the determination of accurate LIDT curves for different test procedures. We choose to particularly study polycrystalline zinc selenide (ZnSe) material used as substrates for infrared dielectric coatings. Irradiation of ZnSe substrates with parallel laser beam shows that surfaces always break clearly before bulk material, this shows that surfaces must be carefully prepared. We particularly exhibit the influence of polishing processes on substrates LIDT. Then the influence of different cleaning methods before coatings deposition is studied. Practical implications for the fabrication of highly laser resistant multilayer coatings at 2-microns are finally discussed.

Paper Details

Date Published: 15 January 2007
PDF: 8 pages
Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 640316 (15 January 2007); doi: 10.1117/12.695742
Show Author Affiliations
Hélène Krol, Institut Fresnel, CNRS 6133 (France)
CILAS Marseille (France)
Catherine Grèzes-Besset, CILAS Marseille (France)
Laurent Gallais, Institut Fresnel, CNRS 6133 (France)
Jean-Yves Natoli, Institut Fresnel, CNRS 6133 (France)
Mireille Commandré, Institut Fresnel, CNRS 6133 (France)

Published in SPIE Proceedings Vol. 6403:
Laser-Induced Damage in Optical Materials: 2006
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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