Henriques Librantz, Andre FelipeJackson, Stuart D.Jagosich, Fabio HenriqueGomes, LaercioPoirier, GaelRibeiro, Sidney José Lima [UNESP]Messaddeq, Younes [UNESP]2014-05-202014-05-202007-06-15Journal of Applied Physics. Melville: Amer Inst Physics, v. 101, n. 12, 9 p., 2007.0021-8979http://hdl.handle.net/11449/35267The deactivation of the two lowest excited states of Ho3+ was investigated in Ho3+ singly doped and Ho3+, Pr3+-codoped fluoride (ZBLAN) glasses. We establish that 0.1-0.3 mol % Pr3+ can efficiently deactivate the first excited (I-5(7)) state of Ho3+ while causing a small reduction of similar to 40% of the initial population of the second excited (I-5(6)) state. The net effect introduced by the Pr3+ ion deactivation of the Ho3+ ion is the fast recovery of the ground state of Ho3+. The Burshstein model parameters relevant to the Ho3+-> Pr3+ energy transfer processes were determined using a least squares fit to the measured luminescence decay. The energy transfer upconversion and cross relaxation parameters for 1948, 1151, and 532 nm excitations of singly Ho3+-doped ZBLAN were determined. Using the energy transfer rate parameters we determine from the measured luminescence, a rate equation model for 650 nm excitation of Ho3+-doped and Ho3+, Pr3+-doped ZBLAN glasses was developed. The rate equations were solved numerically and the population inversion between the I-5(6) and the I-5(7) excited states of Ho3+ was calculated to examine the beneficial effects on the gain associated with Pr3+ codoping. (c) 2007 American Institute of Physics.9engArtigo10.1063/1.2749285WOS:000247625700012Acesso restritoWOS000247625700012.pdf644604746303465429985038419178150000-0003-3286-9440