3-w damage threshold evaluation of final optics components using Beamlet Mule and off-line testing

Mark R. Kozlowski; Stephen M. Maricle; Ron P. Mouser; Sheldon Schwartz; Paul J. Wegner; Timothy L. Weiland

doi:10.1117/12.354241

23 July 1999 3-ω damage threshold evaluation of final optics components using Beamlet Mule and off-line testing

Mark R. Kozlowski, Stephen M. Maricle, Ron P. Mouser, Sheldon Schwartz, Paul J. Wegner, Timothy L. Weiland

Proceedings Volume 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion; (1999) https://doi.org/10.1117/12.354241
Event: Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 1998, Monterey, CA, United States

Abstract

A statistics-based model is being develop to predict the laser-damage-limited lifetime of UV optical components on the NIF laser. In order to provide data for the mode, laser damage experiments were performed on the Beamlet laser system at LLNL. An early protoype NIF focus lens was exposed to twenty 351 nm pulses at an average fluence of 5 J/cm², 3ns. Using a high resolution optic inspection inspection system a total of 353 damage sites was detected within the 1160 cm² beam aperture. Through inspections of the lens before, after and, in some cases, during the campaign, pulse to pulse damage growth rates were measured for damage initiating both on the surface and at bulk inclusions. Growth rates as high as 79 micrometers /pulse were observed for damage initiating at pre-existing scratches in the surface. For most damage sites on the optic, both on the surface and at bulk inclusions. Growth rates as high as 79 micrometers /pulse were observed for damage initiating at per- existing scratches in the surface. For most damage sites on the optic, both surface and bulk, the damage growth rate was approximately 10(Mu) m/pulse.

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Mark R. Kozlowski, Stephen M. Maricle, Ron P. Mouser, Sheldon Schwartz, Paul J. Wegner, and Timothy L. Weiland "3-ω damage threshold evaluation of final optics components using Beamlet Mule and off-line testing", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); https://doi.org/10.1117/12.354241

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