Broadband gradient-index antireflection coating for ZnSe
- 15 August 1984
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 23 (16) , 2770-2773
- https://doi.org/10.1364/ao.23.002770
Abstract
A gradient-index antireflection coating spanning the 0.6–12.6-μm wavelength range for a ZnSe substrate was designed, fabricated, and tested. The index profile used was a fifth-order polynominal that smoothly matches the substrate. The coating was fabricated using a discrete layer approximation for the gradient-index design using ZnSe and CaF2 deposited by laser-assisted evaporation. Total thickness of the coating was 3 μm. Transmission measurements show good agreement with calculated performance. Reflectivity per surface is μm.Keywords
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