A. Ennos
Mar 1, 1962
Citations
0
Influential Citations
14
Citations
Journal
Journal of the Optical Society of America
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.