Abstract

This chapter discusses the optical properties of crystalline synthetic beryllium oxide (BeO), which have been reported for a very limited number of samples. The main reasons for this lack of data are the toxic properties of the material and the difficulty in growing large optical-quality crystals. BeO is a useful new optical material for the vacuum ultraviolet because of its high transmittance to about 9.4 eV and its apparent resistance to UV radiation damage. Certain calculations have suggested that the overlayers of BeO on metallic reflectors should significantly enhance their hardness to X-ray radiation. Natural bromellite (BeO) and synthetically grown BeO crystals are uniaxially positive. The angle-of-minimum-deviation technique measures the ordinary and extraordinary refractive indices and their dependence on temperature. The ceramic beryllia is optically isotropic compared with the uniaxial crystalline BeO. The chapter presents some classical dispersion parameters for evaluating the infrared optical properties of BeO and also lists the values of n and k for beryllium oxide from various references.

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