Effect of laser pulse duration on damage to metal mirrors for laser IFE

John E. Pulsifer; Mark S. Tillack; S. S. Harilal

doi:10.1117/12.752940

18 December 2007 Effect of laser pulse duration on damage to metal mirrors for laser IFE

John E. Pulsifer, Mark S. Tillack, S. S. Harilal

Proceedings Volume 6720, Laser-Induced Damage in Optical Materials: 2007; 67200D (2007) https://doi.org/10.1117/12.752940
Event: Boulder Damage Symposium XXXIX: Annual Symposium on Optical Materials for High Power Lasers, 2007, Boulder, Colorado, United States

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.

Citation Download Citation

John E. Pulsifer, Mark S. Tillack, and S. S. Harilal "Effect of laser pulse duration on damage to metal mirrors for laser IFE", Proc. SPIE 6720, Laser-Induced Damage in Optical Materials: 2007, 67200D (18 December 2007); https://doi.org/10.1117/12.752940

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