17 May 2016 Designing mid-wave infrared (MWIR) thermo-optic coefficient (dn/dT) in chalcogenide glasses
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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.
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Benn Gleason, Benn Gleason, Laura Sisken, Laura Sisken, Charmayne Smith, Charmayne Smith, Kathleen Richardson, Kathleen Richardson, } "Designing mid-wave infrared (MWIR) thermo-optic coefficient (dn/dT) in chalcogenide glasses", Proc. SPIE 9822, Advanced Optics for Defense Applications: UV through LWIR, 982207 (17 May 2016); doi: 10.1117/12.2229056; https://doi.org/10.1117/12.2229056
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