Energy level decay and excited state absorption processes in dysprosium-doped fluoride glass

Autor(es)

Gomes, Laercio ^[1] ; Henriques Librantz, Andre Felipe ^{[1, 2]} ; Jackson, Stuart D. ^[3]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, Ctr Lasers & Applicat, BR-05422970 Sao Paulo - Brazil

^[2] UNINOVE, Dept Sci, BR-01156050 Sao Paulo - Brazil

^[3] Univ Sydney, Sch Phys, Inst Photon & Opt Sci, Camperdown, NSW 2006 - Australia

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 107, n. 5 MAR 1 2010.
• Citações Web of Science: 19

Resumo

The primary excited state decay processes relating to the (6)H(13/2) -> (6)H(15/2) similar to 3 mu m laser transition in singly Dy(3+)-doped fluoride (ZBLAN) glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the (6)F(9/2), (6)H(7/2) energy levels at 1125 nm and (6)F(11/2), (6)H(9/2) energy levels at 1358 nm established that the energy levels above the (6)H(11/2) level, excluding the (4)F(9/2) level, are entirely quenched by multiphonon emission in ZBLAN glass. The (6)H(11/2) and (6)H(13/2) energy levels emit luminescence with peaks at similar to 1700 and similar to 2880 nm, respectively, but at low quantum (luminescence) efficiencies. The quantum efficiency of the (6)H(11/2) level and (6)H(13/2) level is similar to 9 x 10(-5) and similar to 1.3 x 10(-2), respectively, for {[}Dy(3+)] = 0.5 mol % based on calculations of the radiative lifetimes using the Judd-Ofelt theory. Excited state absorption (ESA) was detected by monitoring the rise time of the 1700 nm luminescence after tuning the probe wavelength across the spectral range from 1100 to 1400 nm. As a result of nonradiative decay of the higher excited states, ESA contributes to the heating of similar to 3 mu m fiber lasers based on Dy(3+)-doped fluoride glass. For {[}Dy(3+)] up to 4 mol %, we found no evidence of energy transfer processes between Dy(3+) ions that influence the decay characteristics of the (6)H(11/2) and (6)H(13/)2 energy levels. (C) 2010 American Institute of Physics. {[}doi:10.1063/1.3311561] (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