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Proceedings Paper

New protective antireflecting coating for multispectral ZnS
Author(s): Caspar C. Clark; Alan H. Lettington; Steven J. Wakeham; Peter S. Jones; Dave Waterman
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Paper Abstract

With the advent of common aperture systems comes a requirement for substrates and coatings that are transparent in both the visible and IR bands. While there are many suitable bulk materials there are surprisingly few coatings available that offer both antireflecting properties and substrate protection. Materials that need little environmental protection tend to be costly to fabricate and machine while others are far too soft to be of any great use. It is for this reason that particular attention has been given to multispectral zinc sulfide which is a relatively cheap material and has good transparency both in the visible and the IR up to -13micrometers . Although it is a soft material (~150kg.mm-2) it may be protected by a range of coatings. This paper will look at two main materials, ZrN deposited by RF reactive sputtering and YF3 by ion assisted deposition (IAD) which when used in conjunction offer both increased durability to the substrate and good tri-color transmittance for practical window applications.

Paper Details

Date Published: 7 September 2001
PDF: 9 pages
Proc. SPIE 4375, Window and Dome Technologies and Materials VII, (7 September 2001); doi: 10.1117/12.439183
Show Author Affiliations
Caspar C. Clark, Thales Optronics (United Kingdom)
Alan H. Lettington, Univ. of Reading (United Kingdom)
Steven J. Wakeham, Univ. of Reading (United Kingdom)
Peter S. Jones, Thales Optronics (United Kingdom)
Dave Waterman, Univ. of Reading (United Kingdom)


Published in SPIE Proceedings Vol. 4375:
Window and Dome Technologies and Materials VII
Randal W. Tustison, Editor(s)

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