Abstract The gold pulse compression gratings (PCG) used in the Bidirectional Grating Compressor (BGC) suffers a nano- and femtosecond dual pulses irradiation. In the case that the ns pre-pulse comes 10 nanoseconds early before the fs pulse, experiments were conducted to investigate damage behaviors under the dual pulse irradiation. 1-on-1 laser induced damage threshold (LIDT) of the ns–fs dual pulses and fs single pulse were tested and compared. Scanning Electron Microscope (SEM) was employed to capture damage onset and exam the damage macro- and micro-morphologies. The mono-shot method, comparison between the damage zone and spatial distribution of laser pulses, was employed to analyze the difference of the damage onset fluences for the two cases thoroughly. It was found that there is no degradation of laser damage resistance due to the ns pre-pulse. Instead, a slightly increase ( ∼ 10%) of fs LIDT caused by the ns pre-pulse was found.

中文翻译：

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纳秒脉冲预辐照对金脉冲压缩光栅抗飞秒激光损伤的影响

摘要 双向光栅压缩机（BGC）中使用的金脉冲压缩光栅（PCG）受到纳秒和飞秒双脉冲辐照。在 ns 预脉冲比 fs 脉冲早 10 纳秒的情况下，进行了实验以研究双脉冲照射下的损伤行为。测试和比较了 ns-fs 双脉冲和 fs 单脉冲的 1 对 1 激光诱导损伤阈值 (LIDT)。使用扫描电子显微镜 (SEM) 捕获损伤开始并检查损伤宏观和微观形态。采用单发法，比较激光脉冲的损伤区域和空间分布，深入分析了两种情况下损伤起始能量密度的差异。发现由于ns预脉冲，激光抗损伤性没有降低。相反，发现由 ns 预脉冲引起的 fs LIDT 略有增加（~10%）。