Abstract

The refractive index n and the absorption coefficient k of evaporated CeO₂ films were measured in the wavelength region from 0.22 μ to 1.0 μ. Films produced by direct evaporation of CeO₂ were found to be extremely durable and nonabsorbing in the visible and can be used as beam splitters and as high-index films in multilayer film combinations. The refractive index of CeO₂ films depends strongly on the temperature of the substrate. An increase of the substrate temperature from 25°C to 300°C increases the refractive index of the condensed film material at λ=550 mμ, from about 2.2 to 2.4. The absorption of CeO₂ films increases strongly below 400 mμ and reaches a maximum at 300 mμ. Evaporated CeO₂ films show the same cubic structure as compact material and crystallize without preferred orientation on amorphous substrates. The crystal size in the condensed films increases with increasing temperature.

© 1958 Optical Society of America

Anodically Produced Multiple Oxide Films for Increasing the Reflectance of Evaporated Aluminum*

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Optical Properties of Evaporated Magnesium Oxide Films in the 0.22–8-μ Wavelength Region

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Antireflection Coatings for Germanium and Silicon in the Infrared*

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Optical properties of sputter-deposited cerium oxyfluoride thin films

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