18 December 2007 Effect of laser pulse duration on damage to metal mirrors for laser IFE
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John E. Pulsifer, John E. Pulsifer, Mark S. Tillack, Mark S. Tillack, S. S. Harilal, 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); doi: 10.1117/12.752940; https://doi.org/10.1117/12.752940


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