Abstract
The optical constants of five highly transparent substrates (polycrystalline , , , ZnSe, and ZnS) were experimentally determined based on a combined technique using both the double optical pathlength transmission method and the ellipsometry method within temperature range 20°C–350°C in the ultraviolet-infrared region (0.2–20 μm). The results show that the refractive index spectra of polycrystalline , , and are similar, but differ from that of polycrystalline ZnSe and ZnS. The thermo-optic coefficient of these highly transparent substrates increases with increasing temperature. The absorption indices show a significant temperature-dependent behavior, which increases with increasing temperature from 20°C to 350°C over the transparent region. For the sake of application, the fitted formulas of the refractive index of the five highly transparent substrates as a function of wavelength and temperature are presented.
© 2018 Optical Society of America
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