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1 August 2017 Improving 355nm laser damage resistance for fluoride mirrors with overcoat layer
Zhen Yu, Hongji Qi, Weili Zhang, Hu Wang, Bin Wang
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Proceedings Volume 10339, Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers; 103390F (2017) https://doi.org/10.1117/12.2269713
Event: Pacific Rim Laser Damage 2017: Optical Materials for High Power Lasers, 2017, Shanghai, China
Abstract
The damage resistance of 355nm laser can be improved for fluoride mirrors with an SiO2 overcoat layer. Three kinds of samples are deposited with the overcoat layer of different thicknesses. Calculated with Stoney equation, the residual stress of the film can be altered to the compressive stress with the increase of the overcoat layer. Through the investigation of the damage pits, we find the damages are the thermal-mechanical coupled and induced by the nodules buried in the fluoride multilayers. The surface morphologies around the damage pits are analyzed from the two respects: Cracks and surface ablation. The two characters of the damage morphologies can be suppressed with the addition of the SiO2 overcoat layer.
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Zhen Yu, Hongji Qi, Weili Zhang, Hu Wang, and Bin Wang "Improving 355nm laser damage resistance for fluoride mirrors with overcoat layer", Proc. SPIE 10339, Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers, 103390F (1 August 2017); https://doi.org/10.1117/12.2269713
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KEYWORDS
Silica
Mirrors
Resistance
High laser damage threshold optical coatings
Morphological analysis
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