Nonlinearities and Dielectric constant of Ge-Se Chalcogenide Glasses
Year: 2025
Type: article
Abstract: We recorded a transmission spectrum of Ge-Se glasses in the UV-visible range, revealing 80-90% transmission of light at room temperature. The percentage of light absorbed by these glasses is only 15%. The applicability of these glasses for the fabrication of single-mode optical fibre is being pursued by their high transmission and nearly nonexistent normal dispersion, while a small anomalous dispersion drop in the transmission is noticed at 720 nm in the UV-visible region. Drop in transmission at higher wavelength is explained in terms of absorption/photodarkening effect. Analysis of prepared glasses reveals direct band-gap material; thus, these materials can be used directly in fibre laser preparation. The refractive index obtained from spectra is modelled by Cauchy expression, and it is valid up to 700nm; beyond 700nm, wavelength increase in refractive index is modelled by poly4. Dielectric characteristics are examined and assessed. Ge-Se glasses have a decreasing dielectric constant as the band gap widens, indicating a decreasing trend in dielectric constant with increasing frequency.
Source: Mapana Journal of Sciences
DOI: 10.12723/mjs.72.5
Author: Deepak Sharma
Institution: Chaudhary Charan Singh University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4412102715