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

Laércio Gomes, Michael Oermann, Heike Ebendorff-Heidepriem, David Ottaway, Tanya Monro, André Felipe Henriques Librantz, Stuart D. Jackson

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The fundamental excited state decay processes relating to the 4I11/24I13/2 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 m 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 m emission efficiency is due to the non-radiative decay bridging the 4I11/24I13/2 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 [Er 2O3] ≥ 2.65 mol. ) without OH- impurities being present.

LanguageEnglish
Article number083111
Pages1-10
Number of pages10
JournalJournal of Applied Physics
Volume110
Issue number8
DOIs
Publication statusPublished - 15 Oct 2011
Externally publishedYes

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erbium
energy levels
glass
decay
excitation
energy transfer
lasers
dipoles
population inversion
ions
pumping
luminescence
pumps
impurities
fluorescence
thresholds
spectroscopy
simulation
interactions

Cite this

Gomes, L., Oermann, M., Ebendorff-Heidepriem, H., Ottaway, D., Monro, T., Felipe Henriques Librantz, A., & Jackson, S. D. (2011). Energy level decay and excited state absorption processes in erbium-doped tellurite glass. Journal of Applied Physics, 110(8), 1-10. [083111]. https://doi.org/10.1063/1.3651399
Gomes, Laércio ; Oermann, Michael ; Ebendorff-Heidepriem, Heike ; Ottaway, David ; Monro, Tanya ; Felipe Henriques Librantz, André ; Jackson, Stuart D. / Energy level decay and excited state absorption processes in erbium-doped tellurite glass. In: Journal of Applied Physics. 2011 ; Vol. 110, No. 8. pp. 1-10.
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abstract = "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 m 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 m 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 [Er 2O3] ≥ 2.65 mol. ) without OH- impurities being present.",
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Gomes, L, Oermann, M, Ebendorff-Heidepriem, H, Ottaway, D, Monro, T, Felipe Henriques Librantz, A & Jackson, SD 2011, 'Energy level decay and excited state absorption processes in erbium-doped tellurite glass', Journal of Applied Physics, vol. 110, no. 8, 083111, pp. 1-10. https://doi.org/10.1063/1.3651399

Energy level decay and excited state absorption processes in erbium-doped tellurite glass. / Gomes, Laércio; Oermann, Michael; Ebendorff-Heidepriem, Heike; Ottaway, David; Monro, Tanya; Felipe Henriques Librantz, André; Jackson, Stuart D.

In: Journal of Applied Physics, Vol. 110, No. 8, 083111, 15.10.2011, p. 1-10.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Oermann, Michael

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AU - Felipe Henriques Librantz, André

AU - Jackson, Stuart D.

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Gomes L, Oermann M, Ebendorff-Heidepriem H, Ottaway D, Monro T, Felipe Henriques Librantz A et al. Energy level decay and excited state absorption processes in erbium-doped tellurite glass. Journal of Applied Physics. 2011 Oct 15;110(8):1-10. 083111. https://doi.org/10.1063/1.3651399