High Performance AR Coatings For Germanium

Ronald R. Willey

doi:10.1117/12.950026

27 February 1989 High Performance AR Coatings For Germanium

Ronald R. Willey

Proceedings Volume 1019, Thin Film Technologies III; (1989) https://doi.org/10.1117/12.950026
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

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.

Citation Download Citation

Ronald R. Willey "High Performance AR Coatings For Germanium", Proc. SPIE 1019, Thin Film Technologies III, (27 February 1989); https://doi.org/10.1117/12.950026

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