| Autor: |
Eliel, Gomes S. N., Kumar, Kagola Upendra, Udo, Paulo T., Astrath, Nelson G. C., Malacarne, Luis Carlos, Baesso, Mauro L., Catunda, Tomaz, Moncorgé, Richard, Jacinto, Carlos |
| Zdroj: |
Journal of the Optical Society of America B: Optical Physics; May 2013, Vol. 30 Issue: 5 p1322-1328, 7p |
| Abstrakt: |
Energy transfer (ET) and heat generation processes in Yb^3+/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 Yb^3+ to 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 (η_1∼0.85 and independent of Ho^3+ concentration) and relatively very low thermal loading (<0.4) for concentration up to 1.5% of Ho_2O_3. An equation was deduced for the description of the TL results that provided the absolute value of η_1 and the number of emitted photons at 2.0 μm per absorbed pump photon by the Yb^3+ ions, the latter reaching 60% for the highest 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. |
| Databáze: |
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