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Proceedings Paper

Effect of laser pulse duration on damage to metal mirrors for laser IFE
Author(s): John E. Pulsifer; Mark S. Tillack; S. S. Harilal
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Paper Abstract

A Grazing Incidence Metal Mirror (GIMM) is a chief candidate for beam delivery for Inertial Fusion Energy (IFE). The goal for GIMM survival is greater than 3×108 laser pulses with 5 J/cm2 laser fluence normal to the incident beam. Laser-induced damage to metal mirrors is primarily a thermomechanical process. Long-term exposure leads to microstructural evolution analogous to fatigue. We have performed laser-induced damage experiments on high damage threshold aluminum mirrors using commercial KrF excimer (248 nm) lasers. We have studied mirror response to standard, 25 ns long-pulses as well as to IFE prototypic, 5 ns short-pulses achieved using a Pockels Cell. Short-pulse damage fluence was found to be better than predicted using simple thermal diffusion scaling from long-pulse results.

Paper Details

Date Published: 18 December 2007
PDF: 8 pages
Proc. SPIE 6720, Laser-Induced Damage in Optical Materials: 2007, 67200D (18 December 2007); doi: 10.1117/12.752940
Show Author Affiliations
John E. Pulsifer, Univ. of California, San Diego (United States)
Mark S. Tillack, Univ. of California, San Diego (United States)
S. S. Harilal, Hyperion Scientific, Inc. (United States)

Published in SPIE Proceedings Vol. 6720:
Laser-Induced Damage in Optical Materials: 2007
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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