Spectral dispersion of linear optical properties for Sm 2O 3 doped B 2O 3PbOAl 2O 3 glasses

Abstract

Glasses having composition (B 2O 3) 25 (PbO) 70 (Al 2O 3) 5 (Sm 2O 3) x,where x=0, 0.5, 1, 2, 3 and 5 g were prepared using the normal melt quench technique. Spectral reflectance and transmittance at normal incidence of the glass samples are recorded with a spectrophotometer in the spectral range 2202200 nm. These measured values are introduced into analytical expressions to calculate the real and imaginary parts of the refractive indices. WempleDiDomenico single oscillator model and one-term Sellmeier dispersion relations are used to model the real refractive indices. Dispersion parameters such as: single oscillator energy, dispersion energy, lattice oscillating strength, average oscillator wavelength, average oscillator strength and Abbes number are deduced and compared. Absorption dispersion parameters such as: Fermi energy, optical energy gap for direct and indirect transitions, Urbach energy and steepness parameter are calculated. Effects of doping Sm 2O 3 on these linear optical parameters are investigated and interpreted. © 2012 Elsevier Ltd. All rights reserved.