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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Energy transfer and energy level decay processes in Tm3+-doped tellurite glass

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Author(s):
Gomes, Laercio [1] ; Lousteau, Joris [2] ; Milanese, Daniel [2] ; Scarpignato, Gerardo C. [2] ; Jackson, Stuart D. [3]
Total Authors: 5
Affiliation:
[1] Ctr Lasers & Aplicacoes, Inst Pesquisas Energet & Nucl, BR-05422970 Sao Paulo - Brazil
[2] Politecn Torino, Dipartimento Sci Mat & Ingn Chim, PhotonLab, I-10129 Turin - Italy
[3] Univ Sydney, Sch Phys, Inst Photon & Opt Sci, Camperdown, NSW 2006 - Australia
Total Affiliations: 3
Document type: Journal article
Source: Journal of Applied Physics; v. 111, n. 6 MAR 15 2012.
Web of Science Citations: 15
Abstract

The primary excited state decay and energy transfer processes in singly Tm3+-doped TeO2:ZnO:Bi2O3:GeO2 (TZBG) glass relating to the F-3(4) -> H-3(6) similar to 1.85 mu m laser transition have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the H-3(4) manifold at 794 nm, the H-3(5) manifold at 1220 nm, and F-3(4) manifold at 1760 nm has established that the H-3(5) manifold is entirely quenched by multiphonon relaxation in tellurite glass. The luminescence from the H-3(4) manifold with an emission peak at 1465 nm suffers strong suppression due to cross relaxation that populates the F-3(4) level with a near quadratic dependence on the Tm3+ concentration. The F-3(4) lifetime becomes longer as the Tm3+ concentration increases due to energy migration and decreases to 2.92 ms when {[}Tm3+] = 4 mol. % as a result of quasi-resonant energy transfer to free OH- radicals present in the glass at concentrations between 1 x 10(18) cm(-3) and 2 x 10(18) cm(-3). Judd-Ofelt theory in conjunction with absorption measurements were used to obtain the radiative lifetimes and branching ratios of the energy levels located below 25 000 cm(-1). The spectroscopic parameters, the cross relaxation and Tm3+(F-3(4)) -> OH- energy transfer rates were used in a numerical model for laser transitions emitting at 2335 nm and 1865 nm. (C) 2012 American Institute of Physics. {[}http://dx.doi.org/10.1063/1.3694747] (AU)