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首页> 外文会议>High-Power Laser Ablation VI pt.2 >Mitigation of Laser Damage Growth in Fused Silica NIF Optics with a Galvanometer Scanned CO_2 Laser
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Mitigation of Laser Damage Growth in Fused Silica NIF Optics with a Galvanometer Scanned CO_2 Laser

机译：用振镜扫描CO_2激光器减轻熔融石英NIF光学器件中激光损伤的增长

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摘要

Economic operation of the National Ignition Facility at the Lawrence Livermore National Laboratory depends on controlling growth of laser damage in the large, high cost optics exposed to UV light at 351 nm. Mitigation of the growth of damage sites on fused silica surfaces greater than several hundred microns in diameter has been previously reported by us using galvanometer scanning of a tightly focused 10.6 μm CO_2 laser spot over an area encompassing the laser damage. Further investigation revealed that fused silica vapor re-deposited on the surface as "debris" led to laser damage at unexpectedly low fluences when exposed to multiple laser shots at 351 nm. Additionally, laser power and spatial mode fluctuations in the mitigation laser led to poor repeatability of the process. We also found that the shape of the mitigation pit could produce downstream intensification that could damage other NIF optics. Modifications were made to both the laser system and the mitigation process in order to address these issues. Debris was completely eliminated by these changes, but repeatability and downstream intensification issues still persist.
机译：劳伦斯·利弗莫尔国家实验室的国家点火设施的经济运行取决于控制暴露于351 nm紫外线的大型，昂贵的光学器件中激光损伤的增长。我们先前已经报道了使用振镜扫描在包含激光损伤的区域上对聚焦的10.6μmCO_2激光点进行检流计扫描，从而减轻了直径大于数百微米的熔融石英表面上损伤部位的生长。进一步的研究表明，熔融石英蒸气以“碎片”的形式重新沉积在表面上，当暴露于351 nm的多次激光照射时，以意外低的注量导致激光损伤。另外，缓解激光器中的激光功率和空间模式波动导致该过程的可重复性差。我们还发现，缓解坑的形状可能会产生下游强化，从而可能损坏其他NIF光学器件。为了解决这些问题，对激光系统和缓解过程都进行了修改。这些变化完全消除了碎片，但可重复性和下游强化问题仍然存在。

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