Abstract

The infrared transmittance of deposited films of tellurium, bismuth, antimony, and magnesium oxide has been measured. These filters are opaque in the visible region and have short wavelength cutoffs varying from 1 to 3 microns. Reflection filters have also been made, for the region from 10μ to 40μ, by roughening the surface of a mirror with emery powder. These filters are used in removing stray radiation from the KBr and KRS-5 regions of the spectrum.

© 1952 Optical Society of America

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