Collection Of theses on high power laser and plasma physics, 2014, 12 (1): 134201, Published Online: May. 27, 2017  

Mechanism of original damage of thin optical components induced by surface particle contamination

Author Affiliations
1 中国科学院上海光学精密机械研究所, 高功率激光物理国家实验室, 上海201800
2 中国科学院大学, 北京100049
Abstract
Based on the optical transmission theory, the reason why front-surface particle contamination may induce the original damage of thin optical components is considered, and a damage mechanism is put forward: The localized thermal deformation of an optical element induced by the thermal effect of particle contamination together with the shading effect of it can disturb the laser beams. Simulated results show that for a high power laser, the localized thermal deformation of thin optical components, which disturbs the laser beam, is an important cause to produce strong light intensity modulations. The surface shape, phase delay, and thermal diffusion length of a localized thermal deformation are constantly changing with the increase of laser pulse shot number, so the highest light intensity modulation will be produced at different positions in the thickness direction or the xy direction on the rear-surface of an optical element. This not only can easily induce some damages on the rear-surface of the optical element, but also cause the interior damages scattered in the thickness direction.

Sun Xiao-Yan, Lei Ze-Min, Lu Xing-Qiang, Fan Dian-Yuan. Mechanism of original damage of thin optical components induced by surface particle contamination[J]. Collection Of theses on high power laser and plasma physics, 2014, 12(1): 134201.

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