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Proceedings Paper

Thin film contamination effects on laser-induced damage of fused silica surfaces at 355 nm
Author(s): Francois Y. Genin; Alexander M. Rubenchik; Alan K. Burnham; Michael D. Feit; J. M. Yoshiyama; Anne Fornier; C. Cordillot; Daniel Schirmann
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Paper Abstract

Fused silica windows were artificially contaminated to estimate the resistance of target chamber debris shields against laser damage during NIF operation. Uniform contamination thin films were prepared by sputtering various materials. The loss of transmission of the samples was first measured. They were then tested at 355 nm in air with an 8- ns Nd:YAG laser. The damage morphologies were characterized by Nomarski optical microscopy and SEM. Both theory and experiments showed that metal contamination for films as thin as 1 nm leads to a substantial los of transmission. The laser damage resistance dropped very uniformly across the entire surface. The damage morphology characterization showed that contrary to clean silica, metal coated samples did not produce pits on the surface, B4C coated silica, on the other hand, led to a higher density of such damage pits. A model for light absorption in the thin film was coupled with a simple heat deposition and diffusion model to perform preliminary theoretical estimates of damage thresholds. The estimates of the loss due to light absorption and reflection pointed out significant differences between metals. The damage threshold predictions were in qualitative agreement with experimental measurements.

Paper Details

Date Published: 23 July 1999
PDF: 7 pages
Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); doi: 10.1117/12.354235
Show Author Affiliations
Francois Y. Genin, Lawrence Livermore National Lab. (United States)
Alexander M. Rubenchik, Lawrence Livermore National Lab. (United States)
Alan K. Burnham, Lawrence Livermore National Lab. (United States)
Michael D. Feit, Lawrence Livermore National Lab. (United States)
J. M. Yoshiyama, Lawrence Livermore National Lab. (United States)
Anne Fornier, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
C. Cordillot, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Daniel Schirmann, Ctr. d'Etudes de Limeil-Valenton/CEA (France)


Published in SPIE Proceedings Vol. 3492:
Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion
W. Howard Lowdermilk, Editor(s)

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