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Abstract: In order to enable high quality lens designs using calcium fluoride CaF2and Heraeus Infrasil 301 Infrasil for cryogenic operating temperatures, wehave measured the absolute refractive index of these two materials as afunction of both wavelength and temperature using the Cryogenic, High-AccuracyRefraction Measuring System CHARMS at NASA-s Goddard Space Flight Center. ForCaF2, we report absolute refractive index and thermo-optic coefficient dn-dTat temperatures ranging from 25 to 300 K at wavelengths from 0.4 to 5.6microns, while for Infrasil, we cover temperatures ranging from 35 to 300 K andwavelengths from 0.4 to 3.6 microns. For CaF2, we compare our indexmeasurements to measurements of other investigators. For Infrasil, we compareour measurements to the material manufacturer-s data at room temperature and tocryogenic measurements for fused silica from previous investigations includingone of our own. Finally, we provide temperature-dependent Sellmeiercoefficients based on our measured data to allow accurate interpolation ofindex to other wavelengths and temperatures.



Author: Douglas B. Leviton, Bradley J. Frey, Timothy J. Madison NASA Goddard Space Flight Center

Source: https://arxiv.org/







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