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Proceedings Paper

Laser-induced damage of fused silica at 355 nm initiated at scratches
Author(s): Alberto Salleo; Francois Y. Genin; J. M. Yoshiyama; Christopher J. Stolz; Mark R. Kozlowski
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Paper Abstract

Scratches of measured width were produced on the surface of a IV grade fused silica window using a diamond tip. Two scratch morphologies were observed: plastic and brittle. The scratches were irradiated with a 355 nm laser pulse. The laser-induced damage threshold (LIDT) of the unscratched output surface was 15 J/cm2 at 3-ns. The LIDT of the scratched surface as a function of scratch width was then measured for both input and output surface scratches. Input surface scratches of width smaller than 10 micrometers did not influence the LIDT of the silica window. On the output surface, 7 $mUm wide scratches lowered the LIDT by a factor of two. For larger scratches, the LIDT reached an asymptotic value of 5 J/cm2 on both input and output surface. Possible reasons for this LIDT drop could be electric field enhancement in the cracks below the scratch, the presence of contamination particles in the scratch, or the weakening of the material because of existing mechanical flaws.

Paper Details

Date Published: 20 April 1998
PDF: 7 pages
Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); doi: 10.1117/12.307039
Show Author Affiliations
Alberto Salleo, Lawrence Livermore National Lab. (United States)
Francois Y. Genin, Lawrence Livermore National Lab. (United States)
J. M. Yoshiyama, Lawrence Livermore National Lab. (United States)
Christopher J. Stolz, Lawrence Livermore National Lab. (United States)
Mark R. Kozlowski, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3244:
Laser-Induced Damage in Optical Materials: 1997
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; M. J. Soileau, Editor(s)

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