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Versatile high-precision multiple-pass reflectometer

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Abstract

A confocal mirror assembly is used to measure radiant reflectances in excess of 0.99 with high precision. The mirrors can be either plano or curved with a few diopters of power, and the angle of incidence can vary from 5° to 70°. Multilayer dielectric reflectors consisting of alternate layers of tantalum pentoxide and silica were prepared by evaporation in a vacuum. A maximum reflectance of 0.9996 ± 0.0002 was measured at 520 nm.

© 1978 Optical Society of America

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