Abstract

We describe a design concept for broadband anti-reflection coatings for the mid-infrared that allows thinner film thickness and characterize its properties in the mid-infrared range from 7 μm to 12 μm. Two demonstrator coatings comprising zinc sulfide, yttrium fluoride, and germanium, all of which are deposited by electron beam evaporation on indium phosphide substrates, are optimized for the 7–12 μm and the 10–12 μm ranges. They exhibit less than 1.0% reflection over the target wavelength ranges with notably thin coating thickness.

© 2018 Optical Society of America

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