Optical characterization of Er3+and Yb3+ co-doped barium fluorotellurite glass

Spectroscopic studies of Er3+/Yb3+ co-doped (Ba,La)-fluorotellurite glass composition have been carried out using standard experimental and theoretical methods. Quantitative analyses of the room temperature absorption and emission spectra as well as the emission lifetimes yield various important spectroscopic parameters such as the radiative decay rates, fluorescence branching ratios, and emission/absorption cross sections. In addition, internal radiative quantum yields have been determined for the infrared emission at 1571nm and for the upconversion emission at 547nm. The influence of various non-radiative properties such as multiphonon relaxation, concentration quenching, and quenching by hydroxyl radicals have also been quantitatively estimated and correlated with the observed spectral properties. The comparative studies with the other composition of tellurite and different glasses showed that present glass composition could be a potential candidate for the broadband amplifier. ► Spectroscopic studies of Er3+/Yb3+ co-doped fluorotellurite glass have been carried out. ► Spectral bandwidth of the ∼1570nm emission of Er3+ is found to be ∼82nm. ► Bandwidth at ∼1570nm emission is broader compared to germanate, silicate, and phosphate glasses.