Measurement of infrared multilayer filters at temperatures down to 4 deg K

J S Seeley, R Hunneman, A Whatley

SPIE Proceedings, 325, Pages 180-183 (1982)


Measurement is reported at 4 deg K (and blocked transmission below 10-5) of PbTe/ZnS thin-film filters deposited on Ge substrates. The reduced carrier-absorption which is obtained by cooling these PbTe films is found to accord with simple theory. Advantage for various high-performance multilayers by cooling is significant at the longer wavelengths, and has been verified.

DOI: 10.1117/12.933303

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