Energy level decay and excited state absorption processes in erbium-doped tellurite glass

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dc.contributor.authorGomes, L.
dc.contributor.authorOermann, M.
dc.contributor.authorEbendorff-Heidepriem, H.
dc.contributor.authorOttaway, D.
dc.contributor.authorMonro, T.
dc.contributor.authorLibrantz, A.
dc.contributor.authorJackson, S.
dc.date.issued2011
dc.description.abstract<jats:p>The fundamental excited state decay processes relating to the 4I11/2 → 4I13/2 transition in singly Er3+-doped tellurite (TZNL) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the 4I11/2 energy level at 970 nm and selective laser excitation of the 4I13/2 energy level at 1485 nm has established that energy transfer upconversion by way of a dipole-dipole interaction between two excited erbium ions in the 4I13/2 level populates the 4I11/2 upper laser level of the 3 μm transition. This upconversion has been analyzed for Er2O3 concentrations between 0.5 mol. % and 2.2 mol. %. The 4I13/2 and 4I11/2 energy levels emit luminescence with peaks located at 1532 nm and 2734 nm, respectively, with radiative decay efficiencies of 65% and 6.8% for the higher (2.2 mol. %) concentration sample. The low 2.7 μm emission efficiency is due to the non-radiative decay bridging the 4I11/2 → 4I13/2 transition and energy transfer to the OH− groups in the glass. Excited state absorption was observed to occur from the 4I13/2 and 4I11/2 levels with peak absorptions occurring at 1550 nm and 971 nm, respectively. The decay time of the 4I11/2 excited state decreased with an increase in the Er3+ concentration, which related to energy transfer to OH− ions that had a measured concentration of 6.6 × 1018 cm−3. Results from numerical simulations showed that a population inversion is reached at a threshold pumping intensity of ∼80 kW cm−2 for a cw laser pump at 976 nm if [Er3+] ≥ 1.2 × 1021 cm−3 (or [Er2O3] ≥ 2.65 mol. %) without OH− impurities being present.</jats:p>
dc.description.statementofresponsibilityLaércio Gomes, Michael Oermann, Heike Ebendorff-Heidepriem, David Ottaway, Tanya Monro, André Felipe Henriques Librantz and Stuart D. Jackson
dc.identifier.citationJournal of Applied Physics, 2011; 110(8):083111-1-083111-10
dc.identifier.doi10.1063/1.3651399
dc.identifier.issn0021-8979
dc.identifier.issn1089-7550
dc.identifier.orcidEbendorff-Heidepriem, H. [0000-0002-4877-7770]
dc.identifier.orcidOttaway, D. [0000-0001-6794-1591]
dc.identifier.urihttp://hdl.handle.net/2440/68773
dc.language.isoen
dc.publisherAmer Inst Physics
dc.relation.grantARC
dc.rights© 2011 American Institute of Physics
dc.source.urihttps://doi.org/10.1063/1.3651399
dc.titleEnergy level decay and excited state absorption processes in erbium-doped tellurite glass
dc.typeJournal article
pubs.publication-statusPublished

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