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Coupling effect of multi-wavelength lasers in damage performance of beam splitters at 355 nm and 1064 nm

机译：多波长激光器对分光镜在355 nm和1064 nm损伤性能的耦合效应

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摘要

The coupling effect between a 355 nm laser and a 1064 nm laser in damage initiation and morphology formation was investigated on beam splitters. When extra 1064 nm pulse energy was low, 355 nm laser-induced damage thresholds (LIDTs) increased because of laser conditioning, and when 1064 nm pulse energy was high enough, 355 nm LIDTs decreased. Damage morphologies were also studied to explore the damage mechanism at respective wavelengths. For the entirely different electric field intensity distributions, 355 nm laser-induced damages were mainly from nanometer-sized absorbers at upper interfaces, while initiators for the 1064 nm laser were located at substrate-coating interface or substrate subsurface. Under simultaneous illumination, the sensitive defects were still the precursors, and damages also showed the representative damage characteristics induced by a single laser, namely, 355 nm laser-induced small pits and 1064 nm laser-induced large delamination. Further studies also showed that, although the 1064 nm laser fluence was kept unchanged, delamination area grew with the increase of pits, which were induced by the 355 nm laser. A possible mechanism was proposed to interpret the delamination area growth phenomenon.
机译：在分束器上研究了355 nm激光和1064 nm激光在损伤引发和形态形成中的耦合效应。当额外的1064 nm脉冲能量较低时，由于进行激光调节而增加了355 nm激光诱导的损伤阈值（LIDT），而当1064 nm脉冲能量足够高时，则355 nm LIDT降低了。还研究了损伤形态，以探索各个波长下的损伤机理。对于完全不同的电场强度分布，355 nm激光诱导的损伤主要来自上部界面处的纳米尺寸吸收剂，而1064 nm激光的引发剂位于基底涂层界面或基底表面以下。在同时照射下，敏感缺陷仍然是先兆，损伤也显示出由单个激光引起的代表性损伤特征，即355 nm激光引起的小凹坑和1064 nm激光引起的大分层。进一步的研究还表明，尽管1064 nm激光能量密度保持不变，但分层深度随凹坑的增加而增大，而凹坑是由355 nm激光引起的。提出了一种可能的机制来解释分层区域的生长现象。

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