1INFM (Italy) 2Univ. degli Studi di Trento (Italy) 3Lab. de Physique des Lasers, Atomes et Molécules/Univ. des Sciences et Technologies de Lille (France) 4Lab. de Spectrochimie Infrarouge et Raman/Univ. des Sciences et Technologies de Lille (France) 5Istituto di Fotonica e Nanotecnologie/CNR (Italy) 6Istituto di Fisica Applicata Nello Carrara/CNR (Italy)
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In this work we report on spectroscopic properties of Er3+-doped and Er3+/Ce3+-codoped tungsten-tellurite glasses of molar composition 45 TeO2: 39 WO3: 15 Na2O: 1 Er2O3 and 43 TeO2: 39 WO3: 15 Na2O: 1 Er2O3: 2 CeO2, respectively.
Vibrational properties were investigated by Raman spectroscopy. The measured absorption spectra were analyzed by McCumber theory, in order to obtain radiative transition rates and stimulated emission cross sections. The study of de-excitation dynamics of the 4I11/2 and 4I13/2 Er3+ states upon pulsed excitation at 532 nm shows that Ce3+ codoping is highly effective in favoring the population feeding of the 4I13/2 Er3+ level.
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