Abstract
The decay processes relating to the potential laser transition for 2.9 μm emission in single -doped tellurite (TZNF and TZN) glasses have been investigated in detail using time-resolved fluorescence spectroscopy. The selective laser excitation of the and , energy levels at 805 and 1300 nm, respectively, have established that the decay processes of the lowest excited level (i.e., ) entirely favors multiphonon emission in a tellurite glass host. Detailed investigation of the luminescence decay characteristic revealed that two decay constants are involved in the TZNF glass composition; approximately 90% of the decay has a time constant () of 19.6 μs. The remaining centers decay with a time constant due to the fluorine bonds, which are possibly present in the TZNF glass matrix. Slight quenching of for concentration increases to 2 mol. % may indicate energy transfer to molecules in the TZNF glass despite the low content, ; further decrease of (to 9.7 μs) was measured in TZN glass matrix, which is commensurate with the higher density ().
© 2014 Optical Society of America
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