Abstract

Energy transfer (ET) and heat generation processes in ${\mathrm{Yb}}^{3+}/{\mathrm{Ho}}^{3+}$-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 ${\mathrm{Yb}}^{3+}$ to ${\mathrm{Ho}}^{3+}$, 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 (${\eta }_1\sim 0.85$ and independent of ${\mathrm{Ho}}^{3+}$ concentration) and relatively very low thermal loading ($<0.4$) for concentration up to 1.5% of ${\mathrm{Ho}}_2{\mathrm{O}}_3$. An equation was deduced for the description of the TL results that provided the absolute value of ${\eta }_1$ and the number of emitted photons at 2.0 μm per absorbed pump photon by the ${\mathrm{Yb}}^{3+}$ ions, the latter reaching 60% for the highest ${\mathrm{Ho}}^{3+}$ 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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