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Proceedings Paper

Developments in the design and production of error-sensitive smart coatings
Author(s): Henrik Fabricius
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Paper Abstract

The deposition of smart-filters like the V-lambda filter demands a precise knowledge of the refractive index at every position in the multilayered thin-film structure, and the ability to control the optical thickness of each layer precisely. The smart-filters produced by us today are soft coated of Zinc-Sulphide (ZnS) and Misch-Fluoride (MiF). The deposition of the complex multilayered structures is controlled by a computer based system collecting data from a transmission measuring system. Special test runs have revealed that the packing density of the ZnS depends on the physical thickness of the undercoat whereas the packing density of the MiF depends on the substrate temperature and the packing density of the undercoat. The substrate temperature that depends on the radiated heat from the crucibles, the speed of deposition and the radiation of heat to the surroundings is predictable when the thin film design is known. The speed of deposition is servo controlled and the time consumption for the coating process stay within +/- 5 percent of the predicted value.

Paper Details

Date Published: 19 August 1996
PDF: 12 pages
Proc. SPIE 2776, Developments in Optical Component Coatings, (19 August 1996); doi: 10.1117/12.246845
Show Author Affiliations
Henrik Fabricius, Danish Academy of Technical Sciences (Denmark)

Published in SPIE Proceedings Vol. 2776:
Developments in Optical Component Coatings
Ian Reid, Editor(s)

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