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Experimental study of 355 nm laser damage ignited by Fe and Ce impurities on fused silica surface

机译：Fe和Ce杂质在熔融石英表面激发355 nm激光损伤的实验研究

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摘要

Laser-induced damage on fused silica surface is often ignited by absorbing impurities introduced by polishing processing. In order to analyze laser damage mechanism induced by Fe and Ce impurity on fused silica surface, this paper presents laser induced damage threshold of three types of fused silica surface dealed with traditional chemo-mechanical or magnetorheological finishing and carries out the surface impurity analysis, photo-thermal absorption analysis and gray haze damage mechanism analysis. The results show the significant different Ce and Fe impurities on the surface of the three kinds of samples. The two impurities both have a serious influence on laser-induced native damage. The analyses of photo-thermal absorption on the surface of optical element show that the haze damage pits morphology is related to the absorptivity of nanoparticles. The native surface damage threshold induced by Fe nanoparticle is lower than by Ce nanoparticle by analyzing atomic force microscopy images and scanning electron microscopy images. The conclusion is different from previous reports which believe Fe element shows a weak relation with laser-induced damage. This paper also analyzes the relationship between gray haze damage and native damage for the first time. The results are helpful to understanding laser induced damage of fused silica ignited by impurities.
机译：激光对熔融石英表面的损害通常是通过吸收抛光过程中引入的杂质而点燃的。为了分析Fe和Ce杂质对熔融石英表面的激光损伤机理，提出了三种经过传统化学机械或磁流变抛光处理的熔融石英表面的激光损伤阈值，并进行了表面杂质分析， -热吸收分析和灰霾破坏机理分析。结果表明，三种样品表面的铈和铁杂质存在显着差异。两种杂质都对激光引起的自然损伤有严重影响。光学元件表面光热吸收的分析表明，雾度损伤坑的形貌与纳米颗粒的吸收率有关。通过分析原子力显微镜图像和扫描电子显微镜图像，铁纳米颗粒引起的天然表面损伤阈值比铈纳米颗粒低。该结论与以前的报道不同，后者认为铁元素与激光诱导的损伤之间关系较弱。本文还首次分析了灰霾损害与自然灾害之间的关系。研究结果有助于理解激光引起的熔融石英被杂质点燃引起的损伤。

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