Characterizing Ge28Sb12Se60 in the Near- and Mid-Infrared

Undergraduate Honors Thesis

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Citeable URL: https://scholar.colorado.edu/concern/undergraduate_honors_theses/t722h950f

Abstract

This thesis examines applications of chalcogenide glasses and their potential for use in the mid-infrared region and discusses methods by which the bulk loss absorption of these materials can be measured in this regime. The bulk loss was measured for Ge₂₈Sb₁₂Se₆₀ as well as reference sample Ge₃₃As₁₂Se₅₅ in both the near- and mid-infrared, at specific wavelengths of 1.534 μm and 3.677 μm. The bulk loss for the Ge₂₈Sb₁₂Se₆₀ sample was measured to be (0.07 ± 0.2) cm^-1 in the near-infrared and (0.06 ± 0.18) cm⁻¹ in the mid-infrared. This value was measured for the Ge₃₃As₁₂Se₅₅ reference sample to be (0.07 ± 0.2) cm^-1 in the near-infrared and (0.03 ± 0.16) cm^-1 in the mid-infrared. The expected values of bulk loss, calculated using values of extinction coefficients listed on the Refractive Index Database, were 0.059 cm^-1 at 1.534 μm and 0.048 cm^-1 at 3.677 μm for the Ge₂₈Sb₁₂Se₆₀ sample and 0.036 cm^-1 at 1.534 μm and 0.028 cm^-1 at 3.677 μm for the Ge₃₃As₁₂Se₅₅ reference sample. The approximate agreement with expected values, suggests that these measurements provide good order-of-magnitude estimates of the bulk loss values of the two materials, limited by the large error on the approximations. Ultimately, this suggests that both Ge₂₈Sb₁₂Se₆₀ and Ge₃₃As₁₂Se₅₅ can be considered transparent in the infrared.

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