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Proceedings Paper

Laser damage performance of fused silica optical components measured on the beamlet laser at 351 nm
Author(s): Mark R. Kozlowski; Ron P. Mouser; Stephen M. Maricle; Paul J. Wegner; Timothy L. Weiland
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Paper Abstract

A statistics-based model is being developed to predict the laser-damage-limited lifetime of UV optical components on the NIF laser. in order to provide data for the model, laser damage experiments were performed on the Beamlet laser system at LLNL. Three prototype NIF focus lenses were exposed to 351 nm pulses during four experimental campaigns, each consisting of 23 to 38 pulses at NIF relevant fluences. Each lens was sol-gel AR coated and all laser exposures were performed in a vacuum environment. Through inspections of the lens before, during and after the campaigns, pulse-to- pulse damage growth rates were measured for damage initiating both on the surfaces and at bulk inclusions. Radial growth rates measured for rear surface damage was typically 10x higher than that measured in the bulk or at the front surface. No significant correlation of growth rate to precursor type was indicated. For 5 J/cm2, 3 ns pulses the typical radial growth rate was nominally 20 micrometers /pulse. Average growth rates measured on three lenses made by two manufacturers were in good agreement. While the growth rate clearly increased with fluence, the data obtained was insufficient to quantify the dependence. The growth rates reported here were 20x-50x higher than values predicted from off-line studies of bare surfaces in air.

Paper Details

Date Published: 7 April 1999
PDF: 10 pages
Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); doi: 10.1117/12.344415
Show Author Affiliations
Mark R. Kozlowski, Lawrence Livermore National Lab. (United States)
Ron P. Mouser, Lawrence Livermore National Lab. (United States)
Stephen M. Maricle, Lawrence Livermore National Lab. (United States)
Paul J. Wegner, Lawrence Livermore National Lab. (United States)
Timothy L. Weiland, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3578:
Laser-Induced Damage in Optical Materials: 1998
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; Keith L. Lewis; M. J. Soileau, Editor(s)

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