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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Gomes, Laercio [1] ; Lousteau, Joris [2] ; Milanese, Daniel [2] ; Scarpignato, Gerardo C. [2] ; Jackson, Stuart D. [3]
Número total de Autores: 5
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Journal of Applied Physics; v. 111, n. 6 MAR 15 2012.
Citações Web of Science: 15
Resumo

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)

Processo FAPESP: 00/10986-0 - Estudo de geração de radiação ultravioleta pela excitação multifotônica de íons de Nd(3+) e Er(3+) em cristais fluoretos
Beneficiário:Laercio Gomes
Modalidade de apoio: Auxílio à Pesquisa - Regular