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Spectra Properties and Energy Transfer of Bi/Tm Co-doped TiO2-BaO-SiO2-Ga2O3 Glasses

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Author(s): TANG Han, XIA Hai-Ping

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 7;
Start page: 696;
Date: 2013;
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Keywords: near-infrared emission; active Bi ions; Tm ions; Inokuti-Hirayama model

ABSTRACT
Bi, Tm singly doped and Bi/Tm co-doped titanate glasses were prepared by the conventional melt quenching method. The enhanced emission of Tm3+: 3H4→3F4 transition at ~1485 nm, and the quenched emission of Tm3+: 3F4→3H6 transition at ~1810 nm were observed in Bi/Tm co-doped glasses under 808 nm excitation. Under 980 nm excitation, no Tm-relevant emission was observed in Tm singly doped glasses, while the emission of Tm3+: 3F4→3H6 transition at ~1810 nm was observed in Bi/Tm co-doped glasses. These results indicated that the energy transfer occurred between active Bi ions and Tm3+ in Bi/Tm co-doped glasses, in which the energy corresponding to Bi-related emission level excited the Tm3+ from 3F4 to the 3H4 level under 808 nm excitation and from 3H6 to the 3H5 level under 980 nm excitation. The energy transfer processes were studied based on the Inokuti-Hirayama model, and the energy transfer of electric dipole-dipole interaction was confirmed to be dominant in Bi/Tm co-doped glasses. The energy transfer efficiency from Bi to Tm ions was estimated to be ~60% from the obtained lifetime of emission. Broadband emission covering 1200-1600 nm indicates Bi/Tm co-doped titanate glasse as potential material for broadband optical fiber amplifiers and tunable lasers.
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