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The transmission spectrum of a Se 95 Te 5 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 E 0 , dispersion energy E d , optical width of the band gap E g , and linear (n) and nonlinear (n 2 ) 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.

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