Spectroscopic properties of the 1.8μm emission of Tm3+/Yb3+ codoped TeO2–ZnO–Bi2O3 glasses with efficient energy transfer
Tm 3+ -doped and Tm 3+ /Yb 3+ -codoped TeO 2― ZnO ― Bi 2 O 3 (TZB) glasses are prepared by melt-quenching method. The Judd-Ofelt intensity parameters (Ω t t = 2, 4, 6), radiative transition rate, and radiative lifetime of Tm 3+ are calculated based on the absorption spectra. The 1.8 μm emission of the samples is investigated under 980 nm laser excitation. The absorption, emission cross-sections, and gain coefficient of Tm 3 + : 3 F 4 → 3 H 6 are calculated. The energy transfer processes of Yb 3+ ―Yb 3+ and Yb 3+ ― Tm 3+ are analyzed, the results show that the Yb 3+ ions can transfer their energy to Tm 3+ ions with large energy transfer coefficient, and a maximum efficiency of 79%.