Study of the Glass Transition Temperature of As‐S Glasses for the Fabrication of Chalcogenide Optical Fibers

Abstract

Values of glass transition temperature (Tg) and of linear expansion coefficient (α) for Asx S100−x glasses were measured in the range of concentrations 35 × 42. Because of the importance of the glass formation region 35 × 42 for the optical fibers elaboration, special attention was made on high‐pure Asx S100−x glasses. For the glass in the range of 35 × 38, we measure Tg with the interval of x equal to 1 at.% of arsenic. We also measured the Tg values with the interval of x equal to 0.5 at.% of As. We obtained nonlinear behavior of Tg, reflecting the change in molecular composition of As‐S glass in the glass composition range studied. The control of such parameters is important to produce optical fibers with specific numerical aperture.