Abstract

The optical properties of evaporated lead monoxide were investigated in relation to their use as high-refractive-index films for multilayer optical filters. Refractive index of the films was measured throughout the visible wavelengths by a spectrophotometric method. nD=2.55 and ν (reciprocal dispersion)=8.8. The optical absorption coefficient, appreciable in the visible range when oxide is evaporated in high vacuum, could be kept below k=0.004 by evaporating in low-pressure oxygen. Strong absorption appeared in the violet and ultraviolet. Cementing properties and atmospheric effects on the films were also investigated.

© 1962 Optical Society of America

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