A thin film of the ternary chalcogenide glassy alloy (As2Se3)90Ge10 has been deposited on a glass substrate by the thermal evaporation technique under vacuum. The optical parameters, refractive index (n) and extinction coefficient (k), have been calculated in the wavelength range 400–1500 nm by analysing the transmission spectrum. The dispersion of the refractive index is described in terms of a Wemple–DiDomenico single oscillator model. The value of the static refractive index has been found to be 2.518. The optical absorption edge is described using a non-direct transition model proposed by Tauc and the optical band gap calculated by Tauc's extrapolation is 1.58 ± 0.01 eV. The dielectric properties and optical conductivity has also been calculated.

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