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Proceedings Paper

Early thermal damage in optical coatings identified by infrared spectral signatures
Author(s): Sangho S. Kim; Nicholas T. Gabriel; Wing S. Chan; Joseph J. Talghader
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Paper Abstract

Laser induced damage can take several forms. Perhaps the most common is thermal breakdown, caused by heating of the coating to a catastrophic failure induced by local melting, delamination, evaporation, or some other change. We demonstrate that micromachined dielectric membranes show strong differences in their hydroxyl signatures as measured by Fourier transform infrared spectroscopy. The changes correspond to regions of high fluence (3200 J/cm2) from a Nd:YAG laser. It is found that the absorption peaks associated with O-H stretching mode decrease after laser treatment, indicating a reduction in the number of film hydroxyl groups.

Paper Details

Date Published: 31 December 2009
PDF: 9 pages
Proc. SPIE 7504, Laser-Induced Damage in Optical Materials: 2009, 75041A (31 December 2009); doi: 10.1117/12.835783
Show Author Affiliations
Sangho S. Kim, Univ. of Minnesota (United States)
Nicholas T. Gabriel, Univ. of Minnesota (United States)
Wing S. Chan, Univ. of Minnesota (United States)
Joseph J. Talghader, Univ. of Minnesota (United States)

Published in SPIE Proceedings Vol. 7504:
Laser-Induced Damage in Optical Materials: 2009
Gregory J. Exarhos; Vitaly E. Gruzdev; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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