Abstract
In this paper, Er3+ doped Y2O3 and Nb2O5 modified germanate glasses possessing good thermal stability are reported. On the basis of absorption spectra and Judd–Ofelt theory, a detailed investigation of Judd–Ofelt intensity parameters (Ω2,4,6) and radiative properties is carried out. Moreover, emission cross section at 2.7μm is calculated based on Füchtbauer–Ladenburg equation and compared with other Er3+ doped glass systems. A reasonable energy transfer mechanism is proposed. It is interesting that the emission cross section and radiative transition probability in 5mol% Nb2O5 modified germanate glass are much larger than those with 5mol% Y2O3. Results indicate that present germanate glasses along with excellent 2.7μm spectroscopic performance might have potential application for mid-infrared fiber laser.
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