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Proceedings Paper

Designing mid-wave infrared (MWIR) thermo-optic coefficient (dn/dT) in chalcogenide glasses
Author(s): Benn Gleason; Laura Sisken; Charmayne Smith; Kathleen Richardson
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Paper Abstract

Seventeen infrared-transmitting GeAsSe chalcogenide glasses were fabricated to determine the role of chemistry and structure on mid-wave infrared (MWIR) optical properties. The refractive index and thermoptic coefficients of samples were measured at λ = 4.515 μm using an IR-modified Metricon prism coupler, located at University of Central Florida. Thermo-optic coefficient (dn/dT) values were shown to range from approximately -40 ppm/°C to +65 ppm/°C, and refractive index was shown to vary between approximately 2.5000 and 2.8000. Trends in refractive index and dn/dT were found to be related to the atomic structures present within the glassy network, as opposed to the atomic percentage of any individual constituent. A linear correlation was found between the quantity (n-3•dn/dT) and the coefficient of thermal expansion (CTE) of the glass, suggesting the ability to compositionally design chalcogenide glass compositions with zero dn/dT, regardless of refractive index or dispersion performance. The tunability of these novel glasses offer increased thermal and mechanical stability as compared to the current commercial zero dn/dT options such as AMTIR-5 from Amorphous Materials Inc. For IR imaging systems designed to achieve passive athermalization, utilizing chalcogenide glasses with their tunable ranges of dn/dT (including zero) can be key to addressing system size, weight, and power (SWaP) limitations.

Paper Details

Date Published: 17 May 2016
PDF: 7 pages
Proc. SPIE 9822, Advanced Optics for Defense Applications: UV through LWIR, 982207 (17 May 2016); doi: 10.1117/12.2229056
Show Author Affiliations
Benn Gleason, Clemson Univ. (United States)
Laura Sisken, The College of Optics and Photonics, Univ. of Central Florida (United States)
Charmayne Smith, The College of Optics and Photonics, Univ. of Central Florida (United States)
Kathleen Richardson, Clemson Univ. (United States)
The College of Optics and Photonics, Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 9822:
Advanced Optics for Defense Applications: UV through LWIR
Jay N. Vizgaitis; Bjørn F. Andresen; Peter L. Marasco; Jasbinder S. Sanghera; Miguel P. Snyder, Editor(s)

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