Abstract
Absorption, fluorescence and decay properties of erbium-doped alkalitellurofluorophosphate glasses (RTFP) with the molar compositions of50 (NaPO3)6–10 TeO2–20 AlF3–19 RF–1 Er2O3 (R = Li,Na or K) have been investigated in order to utilize these materials for the development of fibreamplifiers and lasers. The Judd–Ofelt (JO) model was applied to the absorption intensities ofEr3+ (4f11) transitions to determine the JO intensity parametersΩλ (λ = 2,4 or 6). These evaluated intensity parameters are used to calculate thespontaneous emission probabilities and branching ratios from the excited stateJ manifolds tothe lower lying J′ manifolds of Er3+ emission transitions. The radiative lifetimes of these excited states are determined from their respectivespontaneous emission probabilities. Visible and NIR emission spectra have been studied for all threeEr3+-doped tellurofluorophosphate glasses. In particular, for the emission at1.5 µm corresponding to the transition, radiative parameters like the full width at half maximum (FWHM), emission cross-sections(σe) and figureof merit (FWHM × σe) were determined and compared with other hosts. The measured lifetimes of the4S3/2 level are compared with predicted radiative lifetimes calculated from the JO theory. The potentialityof Er3+-doped tellurofluorophosphate glasses for devices such as lasers and optical amplifiers isdiscussed.
Published Version
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