Measurement of infrared multilayer filters at temperatures down to 4 deg K
Seeley, J.S., Hunneman, R. and Whatley, A. (1982) Measurement of infrared multilayer filters at temperatures down to 4 deg K. In: Seddon, R.I. (ed.) Optical thin films. Proceedings of SPIE (325). SPIE, pp. 180-183. ISBN 9780892523603
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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.