High efficiency infrared antireflection coatings (ARCs) for space optics

Details High efficiency infrared antireflection coatings (ARCs) for space optics High efficiency infrared antireflection coatings (ARCs) for space optics

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989infph..29..195n&link_type=abstract

(Eidgenoessische Technische Hochschule Zuerich, International Conference on Infrared Physics, 4th, Zurich, Switzerland, Aug. 22-

Physics

Optics

1

Antireflection Coatings, Electro-Optics, Infrared Astronomy, Infrared Reflection, Optical Properties, Gallium Arsenides, Germanium, Zinc Selenides

Scientific paper

The development of non-quarter-wave IR ARCs for the Ge optics of space electrooptic hardware is described. A novel design-optimization method is applied in which the geometrical thicknesses of the ARC layers are calculated analytically (as explained by Nagendra, 1987). Two ARCs are developed: a three-layer system (ThF4/Ge/ThF4) for use at 7-12 microns and a two-layer system (CdTe/CdSe) for 14-16 microns. The ARCs are deposited in a vacuum-evaporation facility and subjected to optical and durability testing. The results are presented in graphs, and it is demonstrated that the ARCs are durable and transparent over the desired wavelength range and have spectral transmittance characteristics in good agreement with the theoretically predicted values.

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