Abstract
The effective absorption coefficient and the radiation diffusion coefficient are determined for high-porosity calcium fluoride ceramics. A laser photometer designed for recording low transmissions is used for measuring the normal hemispherical transmissivity of cylindrical samples of different thicknesses. Results are given for wavelengths of 0.63, 1.15, 3.39, and 5.25 μm. The thus obtained data are used to calculate the dependence of the bihemispherical reflectivity of a plane layer on the layer thickness.
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Original Russian Text © S.S. Moiseev, V.A. Petrov, S.V. Stepanov, 2007, published in Teplofizika Vysokikh Temperatur, Vol. 45, No. 5, 2007, pp. 707–712.
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Moiseev, S.S., Petrov, V.A. & Stepanov, S.V. The optical properties of high-porosity calcium fluoride ceramics. High Temp 45, 639–644 (2007). https://doi.org/10.1134/S0018151X07050100
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DOI: https://doi.org/10.1134/S0018151X07050100