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https://hdl.handle.net/2440/68773
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Type: | Journal article |
Title: | Energy level decay and excited state absorption processes in erbium-doped tellurite glass |
Author: | Gomes, L. Oermann, M. Ebendorff-Heidepriem, H. Ottaway, D. Monro, T. Librantz, A. Jackson, S. |
Citation: | Journal of Applied Physics, 2011; 110(8):083111-1-083111-10 |
Publisher: | Amer Inst Physics |
Issue Date: | 2011 |
ISSN: | 0021-8979 1089-7550 |
Statement of Responsibility: | Laércio Gomes, Michael Oermann, Heike Ebendorff-Heidepriem, David Ottaway, Tanya Monro, André Felipe Henriques Librantz and Stuart D. Jackson |
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> |
Rights: | © 2011 American Institute of Physics |
DOI: | 10.1063/1.3651399 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1063/1.3651399 |
Appears in Collections: | Aurora harvest IPAS publications |
Files in This Item:
File | Description | Size | Format | |
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hdl_68773.pdf | Published version | 1.96 MB | Adobe PDF | View/Open |
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