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- W4384695963 abstract "CaF 2 , BaF 2 , and MgF 2 are low-index, infrared-transparent materials that are extensively used in optical systems. Despite their technological importance, a systematic investigation into the temperature dependence of their optical properties is lacking. In this study, spectroscopic ellipsometry was used to obtain the refractive index of monocrystalline CaF 2 , BaF 2 , and MgF 2 for wavelengths between 220 nm and 1700 nm, and for temperatures between 21 °C and 368 °C. The raw ellipsometric data was fit to a Sellmeier model with temperature-dependent oscillator terms to extract the real part of the refractive index of each material. The refractive index of CaF 2 and BaF 2 was observed to decrease linearly with increasing temperature, which can be largely attributed to a reduction in the mass density due to thermal expansion. In contrast, the refractive index of MgF 2 was found to vary nonlinearly with temperature, which suggests competing effects from the material’s electronic polarizability. The temperature-dependent refractive index data reported here provide a finely-resolved mapping of the thermo-optic coefficient for these three materials, which could inform the development of optical devices operating at elevated or unsteady temperatures." @default.
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- W4384695963 date "2023-07-26" @default.
- W4384695963 modified "2023-09-25" @default.
- W4384695963 title "Temperature-dependent optical properties of monocrystalline CaF₂, BaF₂, and MgF₂" @default.
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- W4384695963 doi "https://doi.org/10.1364/ome.496246" @default.
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