Abstract
The main spectroscopic properties of a new B-Te-Na-Si-Al:Er<sup>3+</sup> glass are investigated. The Judd-Ofelt (JO) intensity parameters (Ωt), the spontaneous emission probabilities, the branching ratios and the radiative lifetimes for each observed Er3<sup>+</sup>-ion levels were determined. The stimulated emission cross section, the fluorescence full width at half maximum (FWHM), Δλ<sub>eff</sub>, the Δλ<sub>eff</sub> x σe factor, and the gain spectra of the main Er<sup>3+</sup>-ion lasing emission (<sup>4</sup>I<sub>13/2</sub>→<sup>4</sup>I15/2) are obtained after exciting the glass sample at 532 nm (<sup>4</sup>I<sub>15/2</sub> →<sup>4</sup>S<sub>3/2</sub> ). The absorption cross section of the <sup>4</sup>I<sub>15/2</sub>→4I13/2 transition of the Er<sup>3+</sup>-ions was also obtained from absorption spectrum of the new glass. The results are compared with those reported for other Er<sup>3+</sup>-doped oxide glasses pumped at various excitation wavelengths, indicating the new Er<sup>3+</sup>- doped boro-tellurite glass has potential properties as an optical amplifier in the C-telecommunication window (1.53 μm) and a IR tunable laser. Additionally a radiative energy transfer from the glass host to the Er3+-ions was observed at 520 nm by exciting the glass sample at 466 nm into the Er<sup>3+</sup>-ion dark region.
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