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Refractive index of thin films of barium fluoride

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Abstract

The refractive indices of BaF2 thin films have been determined experimentally in the 1–11-μm wavelength range. They are found to be significantly lower than the corresponding bulk values and to vary markedly as a function of the deposition rate. A quarterwavelength optical thickness layer of BaF2 is shown experimentally to be an effective single-layer antireflection coating for NaCl and KCl surfaces at 10.6-μm wavelength and to have a high damage threshold for high-power cw CO2 laser radiation.

© 1982 Optical Society of America

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