Thermal Stability and Spectral Properties of Tm3+-Yb3+ CO-Doped Tellurite Glasses

Glasses of the system 75TeO(2)-20ZnO-5La(2)O(3)-0.8Tm(2)O(3)-xYb(2)O(3) were prepared by high temperature melt cooling method. Results of differential scanning calorimetry indicate that, all glass samples have excellent thermal stability. Judd-Ofelt strength parameters, spontaneous emission probabilities, fluorescence branching rations, fluorescence radiative lifetime of Tm3+ ions in tellurite glass were calculated. The impact of Yb3+ concentration on the fluorescence properties of Tm3+ ions in the S band under the pumping wavelength of 465 nm was investigated in a suggestion that, (3) H (4) radiative lifetimes will be prolonged and the performance of optical amplifier gain of Tm3+ in tellurite glass co-doped with 0.5 mol % Yb3+ ions will be improved.