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Study on optical constants of coatings at different temperatures
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Paper 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.

Paper Details

Date Published: 8 July 2019
PDF: 6 pages
Proc. SPIE 11063, Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers, 110631E (8 July 2019); doi: 10.1117/12.2540401
Show Author Affiliations
Xiaoyan Wang, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Key Lab. of Materials for High Power Laser (China)
Kui Yi, Shanghai Institute of Optics and Fine Mechanics (China)
Key Lab. of Materials for High Power Laser (China)
Guohang Hu, Shanghai Institute of Optics and Fine Mechanics (China)
Key Lab. of Materials for High Power Laser (China)
Yuanan Zhao, Shanghai Institute of Optics and Fine Mechanics (China)
Key Lab. of Materials for High Power Laser (China)
Jianda Shao, Shanghai Institute of Optics and Fine Mechanics (China)
Key Lab. of Materials for High Power Laser (China)
CAS Ctr. for Excellence in Ultra-intense Laser Science (China)


Published in SPIE Proceedings Vol. 11063:
Pacific Rim Laser Damage 2019: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)

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