Abstract

Broadband antireflection coatings on ZnSe substrates are designed and manufactured in the 3.5–16-μm IR range. The thin-film materials are YF3 and ZnS produced by electron-beam deposition. To reach optimal performances to as great as 16 μm, we performed an accurate determination of complex indices, taking into account dispersion laws and absorption due to water within layers. With this knowledge, designs are optimized and absorption is reduced at 16 μm.

© 1998 Optical Society of America

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