Optical Spectroscopy of Er~(3+) and Ce~(3+)-codoped TeO_2-WO_3-Na_2O glasses

摘要

In this work we report on spectroscopic properties of Er~(3+)-doped and Er~(3+)/Ce~(3+)-codoped tungsten-tellurite glasses of molar composition 45 TeO_2: 39 WO_3: 15 Na_2O: 1 Er_2O_3 and 43 TeO_2: 39 WO_3: 15 Na_2O: 1 Er_2O_3: 2 CeO_2, 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 ~4I_(11/2) and ~4I_(13/2) Er~(3+) states upon pulsed excitation at 532 nm shows that Ce~(3+) codoping is highly effective in favoring the population feeding of the ~4I_(13/2) Er~(3+) level.