Abstract
Energy transfer (ET) and heat generation processes in -codoped low-silica calcium aluminosilicate glasses were investigated using thermal lens (TL) and photoluminescence measurements looking for the emission around 2.0 μm. Stepwise ET processes from to , upon excitation at 0.976 μm, produced highly efficient emission in the mid-infrared range at around 2.0 μm, with high fluorescence quantum efficiency ( and independent of concentration) and relatively very low thermal loading () for concentration up to 1.5% of . An equation was deduced for the description of the TL results that provided the absolute value of and the number of emitted photons at 2.0 μm per absorbed pump photon by the ions, the latter reaching 60% for the highest concentration. These results suggest that the studied codoped system would be a promising candidate for the construction of photonic devices, especially for medical applications.
© 2013 Optical Society of America
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