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Optical properties of chalcogenide glasses from the system As2Se3-Ag4SSe-PbTe

T. BABEVA1,* , V. VASSILEV2, P. GUSHTEROVA1, A. AMOVA3, G. ALEXIEVA4, V. STRASHILOV4, P. PETKOVA3

Affiliation

  1. Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 109, 1113 Sofia, Bulgaria
  2. University of Chemical Technology and Metallurgy, Department of Non-Ferrous Metals Metallurgy and Semiconductor Technologies, 8 Kliment Ohridski Blvd., 1756 Sofia, Bulgaria
  3. University of Architecture, Civil Engineering and Geodesy, Hydrotechnical Faculty, Department of Physics, 1 Hristo Smirnenski Blvd., 1046 Sofia, Bulgaria
  4. Sofia University, Faculty of Physics, Department of Solid State Physics and Microelectronics, 5 J. Bourchier Blvd., 1164 Sofia, Bulgaria

Abstract

Seven glasses from the system As2Se3-Ag4SSe-PbTe with appropriately chosen compositions are characterized optically through measurements of their transmittance (T) and reflectance (R) in a wide spectral range covering UV, VIS and NIR. These new chalcogenide glasses are characterized with a wide region of glass formation. For calculation of the optical properties both the Tauc-Lorentz parametrization model and the Newton-Raphson algorithm are used. Thus refractive index n, extinction coefficient k, absorption coefficient α, optical bandgap energy Eg opt , and Urbach energy EU, are obtained. Changing the composition, a considerable variation of the refractive index is achieved, the characteristic absorption edge related energies remaining practically constant. A correlation between optical parameters, glass composition and density is established and discussed..

Keywords

Chalcogenide glasses, UV-VIS-NIR spectroscopy, Tauc-Lorentz model, Optical properties.

Submitted at: May 7, 2016
Accepted at: April 6, 2017

Citation

T. BABEVA, V. VASSILEV, P. GUSHTEROVA, A. AMOVA, G. ALEXIEVA, V. STRASHILOV, P. PETKOVA, Optical properties of chalcogenide glasses from the system As2Se3-Ag4SSe-PbTe, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 3-4, pp. 204-210 (2017)