Advanced search
Start date
Betweenand
(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 level decay and excited state absorption processes in dysprosium-doped fluoride glass

Full text
Author(s):
Gomes, Laercio [1] ; Henriques Librantz, Andre Felipe [1, 2] ; Jackson, Stuart D. [3]
Total Authors: 3
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of Applied Physics; v. 107, n. 5 MAR 1 2010.
Web of Science Citations: 19
Abstract

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)