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Proceedings Paper

Multilayer coatings--the basis for cryogenic infrared filters: technology, peculiarities, and possibilities for application
Author(s): Alla I. Belyaeva
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Paper Abstract

Four main multilayer coatings are manufactured. Different combinations of these coatings allow to solve various tasks connected with the filtration of middle range infrared light. The cut-on coatings are the base of the construction, which divides all spectrum in two different parts: high transmission and full blocking. In order to obtain a cut-on- filter with good transmission and rejection characteristics, it was necessary to coat both sides of the substrate. One multilayer serves as the principal high-pass stack and the auxiliary--to achieve full blocking. The design, manufacture and optimum performance of coatings is discussed. The coatings are composed of PbTe/ZnS symmetric stacks deposited on two sides of a ZnSe(ZnS) or germanium substrate. Transmission characteristics of the different infrared interference filters are presented. It is shown that the set of materials which was chosen for such kind of coatings made it possible to get both steady optics characteristics from room temperature up to 4.2 K, high mechanical and thermal stability, as many property, which we need for cryogenic cooling: to realize stable layer in vacuum; good adhesion; dilatometric compatibility without hygroscopicity. The coatings are very simple. They contain the layers of two materials and final principal multilayers contain only ten layers. The coatings were tested on thermal and mechanical stability.

Paper Details

Date Published: 28 June 1999
PDF: 6 pages
Proc. SPIE 3793, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials, (28 June 1999); doi: 10.1117/12.351401
Show Author Affiliations
Alla I. Belyaeva, Institute for Low-Temperature Physics and Engineering (Ukraine)

Published in SPIE Proceedings Vol. 3793:
Operational Characteristics and Crystal Growth of Nonlinear Optical Materials
Ravindra B. Lal; Donald O. Frazier, Editor(s)

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