Dispersion of the refractive index of a samarium-doped Se⁹⁵Te⁵ chalcogenide glassy semiconductor

The transmission spectrum of a Se⁹⁵Te⁵ chalcogenide glassy semiconductor doped with samarium (0.05, 0.1, 0.25, 0.5, and 1 at %) is studied; the Swanepoel method and the single-oscillator model are used to determine the oscillator energy E⁰, dispersion energy E^d, optical width of the band gap E^g, and linear (n) and nonlinear (n²) refractive indices. The changes in the values of these parameters as a result of doping are attributed to modification of the local structure and to a change in the concentration of defect states