Abstract
Tm3+ doped Bi2O3-GeO2-Na2O glass samples were synthesized by conventional melt-quenching method. The Raman spectra measurements showed the maximum phonon energy of prepared glass is 794 cm−1, which is considerably lower than silicate glasses. Based on the measured absorption spectra, Judd-Ofelt intensity parameters, spontaneous radiative transition probabilities and radiative lifetimes were calculated to elucidate the radiative properties of Tm3+ in the presented glass. Intense near infrared emission around ~2 μm was obtained under the pump of 808 nm laser diode. A large stimulated emission cross section (5.51 × 10−21 cm2 at 1851 nm) of Tm3+: 3F4 → 3H6 was achieved in the prepared bismuth germanate glass doped with 1 mol% Tm2O3. Besides, the energy transfer processes among Tm3+ were analyzed using the extended overlap integral method. These results indicate that the presented glass is a promising candidate for ~2 μm laser applications.
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