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Spectroscopy and concentration quenching of the infrared emissions in Tm3+-doped TeO2-TiO2-Nb2O 5 glass

AuthorsBalda, Rolindes ; Fernández, Joaquín ; García-Revilla, Sara; Fernández Navarro, José María
Issue Date2007
PublisherOptical Society of America
CitationOptics Express 15: 6750- 6761 (2007)
AbstractIn this work, we report the optical properties of Tm3+ ions in tellurite glasses (TeO2-TiO2-Nb2O5) for different Tm3+ concentrations ranging between 0.05 and 1 wt%. Judd-Ofelt intensity parameters have been determined to calculate the radiative transition probabilities and radiative lifetimes of excited states. The stimulated emission cross-sections of the infrared emissions at 1487 nm and 1800 nm have been determined from the line shape of the emission spectra and the lifetimes of levels 3H4 and 3F4 respectively. The emission spectra obtained under 793 nm excitation reveal the existence of energy transfer via cross-relaxation among Tm3+ ions. As a result, the intensity of the infrared 3H4→ 3F4 emission at 1487 nm decreases in relation to the one at 1800 nm, as concentration increases. The non-exponential character of the decays from the 3H4 level with increasing concentration indicates the presence of a dipole-dipole quenching process assisted by energy migration. The self-quenching of the 3F4→ 3H6 emission at 1800 nm can be attributed to limited diffusion within the active centers. © 2007 Optical Society of America.
Identifiersdoi: 10.1364/OE.15.006750
issn: 1094-4087
Appears in Collections:(CFMAC-IO) Artículos
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