26 September 2003 Optical properties of durable oxide coatings for infrared applications
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Abstract
There is a continuing need for durable and protective coatings for long wavelength infrared (LWIR) windows and domes as a result of the environmental and mechanical vulnerability of most LWIS transparent materials. Diamond coatings would be ideal except for the fact that relatively high deposition temperatures are required to deposit films having low optical absorption. Diamond-like carbon films deposited at low temperatures are typically too absorbing or highly stressed. Certain transition metal oxide films can be used successfully for many applications, are very durable and can be deposited by traditional thin film deposition methods. In this study, Y2O3, ZrO2 and HfO2 films are deposited and characterized, in particulara their absorption coefficients as a function of wavelength are derived at wavelengths in the LWIR. Durable oxide coatings are deposited over full-size LWIR windows.
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Ralph Korenstein, Ralph Korenstein, P. Cremin, P. Cremin, T. E. Varitimos, T. E. Varitimos, Randal W. Tustison, Randal W. Tustison, } "Optical properties of durable oxide coatings for infrared applications", Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); doi: 10.1117/12.500966; https://doi.org/10.1117/12.500966
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