Abstract
Glasses with compositions (99.5-χ) GeO2-χBaO-0.5Bi2O3 (χ=3, 6, 9 mol%)and (99.5-φ)GeO2-φWO3-0.5Bi2O3 (φ=3，6，9 mol%)were prepared by conventional melting method. Their emission spectra (using 800nm LD excitation), fluorescence decay curves, absorption spectra and DTA curves were measured. Concomitant with the increase of WO3 concentration in the glasses system GeO2-WO3-Bi2O3, were the enhancement of glass thermal stability and emission intensity (centered at 1260nm) as well as the increase of FWHM and lifetime, and along with the increase of BaO concentration in the glass system GeO2-BaO-Bi2O3, were the enhancement of emission intensity (centered at 1290nm), the increase of FWHM and the prolongation of lifetime. In addition, in both groups, the absorption edges showed a red-shift with the increasing amount of WO3 or BaO, indicating that the Bi5+ ions may be responsible for the super broadband emission. In particular, the values of σp×τ and σp×Δλ parameters deduced from the emission properties suggested that the prepared glasses are a kind of promising material for optical amplifier covering the O to S communication bands.
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