Thin Film Materials and Deposition Techniques for Infra-Red Coatings
Technical research rept.
FRANKFORD ARSENAL PHILADELPHIA PA
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This report describes the coating materials and deposition techniques used for producing film systems in the mid-IR spectral region 2.0 - 14.0 micrometers on Ge windows. It discusses the selection of coating materials and establishes the optical and physical properties of a low middle and high index film material suitable for film systems designed for use at 10.6 micrometers. Four IR coating designs were fabricated and their spectral characteristics compared to a computer generated tolerance analysis of the theoretical designs. For this work the following low index materials and mixtures were investigated to determine which would be the optimal choice Calcium fluoride Magnesium fluoride Mixtures of CaF2,MgF2 Mixtures of CaF2, Al2O3 Glass, SiO2 Cryolite, Na3AlF6 and ZnS Tests for adhesion, abrasion and durability were made for each film.
- Coatings, Colorants and Finishes