Abstract

In this paper experimental results on mild PbTe material and vacuum deposited multilayers are reported. Optical absorption of mild PbTe is determined by envelope methods and found to be different from that of stoichiometric PbTe on cooling. Generally the performance of multilayer coatings which are composed of mild PbTe/ZnSe is deteriorated in middle infrared band when temperature decreases. The wavelength shift of a multilayer filter is essentially a linear function of filter temperature.

© 1992 Optical Society of America