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The refractive index, relative to air, of fusion-cast strontium fluoride was determined from 0.2138µm to 11.475µm by means of the minimum-deviation method. Measurements were made on a precision spectrometer at a controlled room temperature near 20 °C. The experimental data were fitted to a Sellmeier-type dispersion equation which permits refractive index interpolation within several parts in 10-5. The index of SrF2 is compared graphically with that of BaF2 and CaF2.
Alkaline earth fluorides, refractive index, strontium fluoride
Ceramics, Glass, and Solid State Science Division National Bureau of Standards, Washington, D. C.