PREPARATION AND CHARACTERIZATION OF TELLURIUM OXIDE-BASED GLASS - LI2O-TIO2-TEO2 SYSTEM

Li2O-TiO2-TeO2 glass systems presenting large optical non-linearities are promising materials for optical device applications. The preparati on and characterization of xLi(2)O:5TiO(2):(100 - x)TeO2 glass systems with x - 5, 10, 15, 20 and 25 mol% are described. The glasses were me lted in a high-purity alumina crucible placed in an electrical resista nce furnace at 950 degrees C for 30 min. The characterization was done by X-ray diffraction, Raman scattering, density, dilatometry, UV-VIS cut-off, light absorption and linear refractive index measurements. Th e experimental results indicate that there is a structural change in t he glass network for Li2O concentrations in the range 10-20 mol%. We h ave also used Lines' theoretical model to estimate the third-order non -linear optical susceptibility. The values obtained are comparable wit h experimental data found in the literature for this glass system.