Structure-Terahertz properties relationships in tellurite glasses

Tellurite glasses are well known for their linear and nonlinear optical properties, but their terahertz (THz) properties are not yet fully explored. We have studied the THz properties of glasses in the 80TeO2- (20-x)-Li2O-xWO3 system for x = 5, 10, 15 and 20% mol and 80TeO2- (20-x)-WO3-xBi2O3 system for x = 2 and 5% mol. Additionally, limited substitution of Li with Na has also been studied to explore mixed-alkali effect in this family of glasses. The glass samples were prepared by batching, melting, quenching, and annealing, and characterized using time-domain terahertz spectroscopy (TDS-THz) over a frequency range of 0.2– 4 THz. We have also used IR, Raman, and UV-Vis absorption spectroscopic techniques. The refractive index of the glasses was measured using an interferometric method. The refractive index generally increases with increasing WO3 concentration. We present our THz results along with a preliminary structure-THz properties relationship in this family of glasses.