Compositional dependence of refractive index and oscillator parameters in TlGaS_(2x)Se_(2(1-x)) layered mixed crystals (0 ≤ x ≤ 1)

摘要

Optical characterization of TlGaS_(2X)Se_(2(1-X)) mixed crystals have been carried out at room temperature using the transmission and reflection measurements in the wavelength range of 400-1100 nm. The spectral dependence of the refractive index for all compositions of studied crystals were obtained. The dispersion of the refractive index is discussed in terms of the Wemple-DiDomenico single-effective-oscillator model. The compositional dependencies of refractive index dispersion parameters: oscillator energy, dispersion energy and zero-frequency refractive index were revealed.