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Proceedings Paper

High Performance AR Coatings For Germanium
Author(s): Ronald R. Willey
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Paper Abstract

The theoretical design of a high efficiency antireflection coating on germanium for the 8 to 11.5 micrometer band is a relatively simple matter, but the reduction to practice of a high durability version of such a coating is not as easy. The first requirement is to reduce the reflection losses due to the very high index of refraction without adding significant absorptance or scattering. The second is to provide resistance to the environmental conditions which might be encountered by the product. The practical problems of stress and adhesion, hardness and abrasion resistance, and salt fog and humidity resistance pose some major challenges to the transformation from a design to a successful coating process. We describe some of our experiences with the evolution of the process from theory to practice, some of the problems encountered, and what we believe we have learned. Due to the extensive number of variables and the constraint on time and resources, the development could not be totally rigorous or exhaustive. The judgement and experience of the development staff was exercised to focus the resources on areas which were perceived to offer the best possibility of a solution to the requirements. The net result of the work described here was a process with considerably improved properties over the starting point of the development.

Paper Details

Date Published: 27 February 1989
PDF: 4 pages
Proc. SPIE 1019, Thin Film Technologies III, (27 February 1989); doi: 10.1117/12.950026
Show Author Affiliations
Ronald R. Willey, Opto Mechanik, Incorporated (United States)

Published in SPIE Proceedings Vol. 1019:
Thin Film Technologies III
Karl H. Guenther; Hans K. Pulker, Editor(s)

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