Spectroscopy and orange-blue frequency upconversion in Pr3+-doped GeO2-PbO-Nb2O5 glass

The visible luminescence of Pr 3+ -doped lead-germanate glass of composition (in mol%) 60GeO2-25PbO-15Nb2O5 has been investigated for different Pr 3+ concentrations and temperatures by using steady-state and time-resolved laser spectroscopy. The fluorescence from the 1 D2 level shows a strong concentration quenching for Pr 3+ concentrations higher than 0.1 mol%. The time evolution of the decays from the 1 D2 level and the concentration dependence of the effective decay rates are consistent with a dipole-dipole quenching process in the framework of a diffusion-limited regime. Anti-Stokes emission from the 3P0 level following excitation of the 1D2 state has been observed for the samples doped with 0.1, 0.5, 1, and 2 mol% of Pr 3+ . The temporal behaviour of the upconverted emission from the 3P0 level together with its quadratic dependence on the excitation energy and its linear dependence on Pr 3+ concentration suggest that an excited-state absorption (ESA) is the dominant mechanism for the upconversion process in this glass.

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