Laser-induced damage of fused silica on high-power laser: beam intensity modulation, optics defect, contamination

Dongfeng Zhao, Mingying Sun, Rong Wu, Xinqiang Lu, Zunqi Lin, Jianqiang Zhu
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引用次数: 15

Abstract

The wedged focus lens of fused silica, one of the final optics assembly’s optics, focuses the 351 nm beam onto target and separates the residual 1053 and 527 nm light with 351 nm light. After the experiment with beam energies at 3ω range from 3 to 5KJ, and pulse shapes about 3ns, the wedged focus lens has laser-induced damage at particular area. Analysis the damage result, there are three reasons to induce these damages. These reasons are beam intensity modulation, optics defect and contamination that cause different damage morphologies. The 3ω beam intensity modulation, one of three factors, is the mostly import factor to induce damage. Here, the n2 nonlinear coefficient of fused silica material can lead to small-scale self-focusing filament because of optics thickness and beam intensity. And some damage-filaments’ tails are bulk damage spots because there are subsurface scratches or metal contaminations.
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高功率激光对熔融石英的激光损伤:光束强度调制、光学缺陷、污染
熔融石英楔形聚焦透镜是最终光学组件的光学元件之一,它将351nm的光束聚焦到目标上,并将剩余的1053和527nm的光与351nm的光分离。实验结果表明,在3ω范围内,光束能量为3 ~ 5KJ,脉冲形状约为3ns时,楔形聚焦透镜在特定区域产生激光损伤。通过对损害结果的分析,得出了造成这些损害的原因。这些原因是光束强度调制、光学缺陷和污染造成的不同的损伤形态。3个因素之一的3ω波束强度调制是诱发损伤的最重要因素。由于光学厚度和光束强度的影响,熔融二氧化硅材料的n2非线性系数可以导致小尺度的自聚焦灯丝。一些破损细丝的尾部是大块的破损点,因为有表面下的划痕或金属污染。
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