Chalcogenide glass thin-film optics for infrared applications

Janardan Nath; Deep Panjwani; R. E. Peale; J. David Musgraves; Pete Wachtel; Jennifer McKinley

doi:10.1117/12.2050532

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3 June 2014 Chalcogenide glass thin-film optics for infrared applications

Janardan Nath, Deep Panjwani, R. E. Peale, J. David Musgraves, Pete Wachtel, Jennifer McKinley

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Proceedings Volume 9085, Sensors and Systems for Space Applications VII; 908507 (2014) https://doi.org/10.1117/12.2050532
Event: SPIE Defense + Security, 2014, Baltimore, Maryland, United States

Abstract

Chalcogenide glasses are increasingly used in infrared-transparent optical systems for space applications due to their relatively low density (compared to Ge or ZnSe), tunable spectral and thermo-mechanical properties, and molding capability. Remaining challenges include their application to thin-film optics and coatings. The high refractive indices of chalcogenide glasses (n ˃ 2.7) suggest the possibility for high reflecting coatings based on few periods of alternating layers with high index contrast. As₂Se₃ thin film deposited by thermal evaporation is investigated using ellipsometry which show optical properties consistent with bulk material. Also we demonstrate a novel method for fabrication of antireflection coating using porous chalcogenide. Possibility of negligible extinction coefficient and low refractive index of this porous coating promises broadband suppression of undesired Fresnel reflections at the interface from infrared optics.

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Janardan Nath, Deep Panjwani, R. E. Peale, J. David Musgraves, Pete Wachtel, and Jennifer McKinley "Chalcogenide glass thin-film optics for infrared applications", Proc. SPIE 9085, Sensors and Systems for Space Applications VII, 908507 (3 June 2014); https://doi.org/10.1117/12.2050532

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