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Proceedings Paper

Mitigation of laser damage on National Ignition Facility optics in volume production
Author(s): James Folta; Mike Nostrand; John Honig; Nan Wong; Frank Ravizza; Paul Geraghty; Mike Taranowski; Gary Johnson; Glenn Larkin; Doug Ravizza; John Peterson; Brian Welday; Paul Wegner
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Paper Abstract

The National Ignition Facility has recently achieved the milestone of delivering over 1.8 MJ and 500 TW of 351 nm laser energy and power on target, which required average fluences up to 9 J/cm2 (3 ns equivalent) in the final optics system. Commercial fused silica laser-grade UV optics typically have a maximum operating threshold of 5 J/cm2. We have developed an optics recycling process which enables NIF to operate above the laser damage initiation and growth thresholds. We previously reported a method to mitigate laser damage with laser ablation of the damage site to leave benign cone shaped pits. We have since developed a production facility with four mitigation systems capable of performing the mitigation protocols on full-sized (430 mm) optics in volume production. We have successfully repaired over 700 NIF optics (unique serial numbers), some of which have been recycled as many as 11 times. We describe the mitigation systems, the optics recycle loop process, and optics recycle production data.

Paper Details

Date Published: 2 December 2013
PDF: 9 pages
Proc. SPIE 8885, Laser-Induced Damage in Optical Materials: 2013, 88850Z (2 December 2013); doi: 10.1117/12.2030475
Show Author Affiliations
James Folta, Lawrence Livermore National Lab. (United States)
Mike Nostrand, Lawrence Livermore National Lab. (United States)
John Honig, Lawrence Livermore National Lab. (United States)
Nan Wong, Lawrence Livermore National Lab. (United States)
Frank Ravizza, Lawrence Livermore National Lab. (United States)
Paul Geraghty, Lawrence Livermore National Lab. (United States)
Mike Taranowski, Lawrence Livermore National Lab. (United States)
Gary Johnson, Lawrence Livermore National Lab. (United States)
Glenn Larkin, Lawrence Livermore National Lab. (United States)
Doug Ravizza, Lawrence Livermore National Lab. (United States)
John Peterson, Lawrence Livermore National Lab. (United States)
Brian Welday, Lawrence Livermore National Lab. (United States)
Paul Wegner, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 8885:
Laser-Induced Damage in Optical Materials: 2013
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau, Editor(s)

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