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Neutral density filters by co-evaporated Ag and SiO2 films for near ir radiation

Atsushi Shibukawa

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Abstract

Optical properties of Ag and SiO2 co-evaporated films were studied in the visible and near ir regions, and a novel neutral density filter for near ir radiation has been proposed. The films, which contain 56-vol.% Ag, exhibit almost wavelength-independent optical transmittance in the longer than 1-μm wavelength region. Neutral density filters, which have desired optical transmittance, can be obtained by controlling the co-evaporated film thickness.

© 1979 Optical Society of America

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