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

J. Pulsifer, M. Tillack, S. S. Harilal
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引用次数: 1

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.
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激光脉冲时间对激光IFE金属镜损伤的影响
掠入射金属反射镜(GIMM)是惯性聚变能(IFE)光束输送的主要候选器件。GIMM存活的目标是大于3×108垂直于入射光束的5 J/cm2的激光脉冲。激光对金属反射镜的损伤主要是一个热机械过程。长期接触会导致类似疲劳的微观结构演变。利用商用KrF准分子(248 nm)激光对高损伤阈值铝镜进行了激光诱导损伤实验。我们研究了标准的25ns长脉冲和使用Pockels电池获得的5ns短脉冲的镜像响应。发现短脉冲损伤影响比用简单的热扩散标度从长脉冲结果预测的要好。
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