The Development, Application And Testing Of Diamond-Like Coatings For Infra-Red Components

A. H. Lettington

doi:10.1117/12.951971

1 May 1986 The Development, Application And Testing Of Diamond-Like Coatings For Infra-Red Components

A. H. Lettington

Proceedings Volume 0590, Infrared Technology and Applications; (1986) https://doi.org/10.1117/12.951971
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

The lack of durability of the outermost coated lens or window of thermal imaging systems had been a problem for many years. It was overcome in the mid-seventies by the development within RSRE of the infra-red transparent diamond-like carbon coating. This material was chemically durable, abrasion resistant and a near perfect match to germanium as a single layer anti-reflection coating. Originally the coatings had reasonable infra-red transmission but their hardness and adhesion were variable. Using our own processes we obtained consistently good coatings with optimised transmission. The application and excellent performance of these coatings on germanium components is described. Another application is the protection of diamond flycut aluminium surfaces where the off-normal reflectivity in the infra-red using conventional coatings can be poor. Having developed these coatings it was then necessary to develop specifications before they could be used in service. The development of coatings test procedures and specifications is also described.

Citation Download Citation

A. H. Lettington "The Development, Application And Testing Of Diamond-Like Coatings For Infra-Red Components", Proc. SPIE 0590, Infrared Technology and Applications, (1 May 1986); https://doi.org/10.1117/12.951971

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