Undergraduate Honors Theses

Thesis Defended

Fall 2015

Document Type

Thesis

Type of Thesis

Departmental Honors

Department

Engineering Physics

First Advisor

Juliet Gopinath

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.

Included in

Optics Commons

Share

COinS