Vol. 24 No. 1 (2025): Mapana Journal of Sciences
Research Articles

Nonlinearities and Dielectric constant of Ge-Se Chalcogenide Glasses

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  • Deepak Sharma
Deepak Sharma
SCRIET, C.C.S. University Meerut, Uttar Pradesh, India
DOI: https://doi.org/10.12723/mjs.72.5

Published 2025-04-05

Keywords

  • Chalcogenide glasses,
  • Bandgap,
  • Refractive index,
  • Susceptibility,
  • Polarizability,
  • Dielectric constant
    • ...More
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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.

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