Study on optical constants of coatings at different temperatures

Xiaoyan Wang; Kui Yi; Guohang Hu; Yuanan Zhao; Jianda Shao

doi:10.1117/12.2540401

8 July 2019 Study on optical constants of coatings at different temperatures

Xiaoyan Wang, Kui Yi, Guohang Hu, Yuanan Zhao, Jianda Shao

Proceedings Volume 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers; 110631E (2019) https://doi.org/10.1117/12.2540401
Event: Pacific Rim Laser Damage 2019 and Thin Film Physics and Applications 2019, 2019, Qingdao, China

Abstract

In order to analyze the thermal damage process under high energy laser irradiation, this paper focused on the high temperature condition and designed experimental device for coatings heating at different temperature. Ellipsometer was applied to measure the ellipsometric parameter (Ψ, ▵) of SiO₂, HfO₂ and Al₂O₃ single layer (prepared by electron beam (EB) evaporation on BK7 glass) at different temperatures, so the variation of optical constants with temperatures was obtained by inversion calculation. With the increase of temperature, the refractive index (n) of SiO₂, HfO₂ and Al₂O₃ single layer first decreased and then increased, the thickness (d) of these layers first increase and then decreased. However, the inflection point occurred at different temperature, and the amount of change was different for the layer with different material. The physical processes of thermal expansion and water evaporation were applied to explain the temperature dependent properties of the dielectric coatings.

Citation Download Citation

Xiaoyan Wang, Kui Yi, Guohang Hu, Yuanan Zhao, and Jianda Shao "Study on optical constants of coatings at different temperatures", Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110631E (8 July 2019); https://doi.org/10.1117/12.2540401

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KEYWORDS

Temperature metrology

Refractive index

Water

Aluminum

Hybrid fiber optics

Glasses

Optical coatings

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