26 May 1999 Ambiguities at the initial stage of the nonradiative energy transfer in solid state laser materials
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New faster detection systems have allowed better measurements of complex fluorescence decays for active ions in laser crystal materials. We have measured a fluorescence decay that shows a fast initial decay followed by a non- exponential behavior that cannot be described satisfactory by most standard models for nonradiative energy transfer process. With current models it is customary to consider three characteristic temporal stages for the luminescent decay: (1) an exponential decay that is described by the first order approximation of the corresponding model at very short times, (2) a non-exponential decay described by the model at intermediate times, and (3) an exponential decay at later times determined by the migration excitation among donor ions. A new model is presented to account for the donor transient with no temporal stages. The master equations are solved in an analytical and exact form. This modeling allows us to consider any sum of interactions to drive the direct energy transfer. The discreetness of the crystal lattice is not neglected and it is taking into account the actual random distribution of activators around each donor. By using our modeling we are able to predict the measured fluorescence decay of the 4F3/2 state of the Nd+3 in Nd(1.5%),Er(20%):YSGG.
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Luis A. Diaz-Torres, Luis A. Diaz-Torres, David S. Sumida, David S. Sumida, Oracio Barbosa-Garcia, Oracio Barbosa-Garcia, M. Antonio Meneses-Nava, M. Antonio Meneses-Nava, } "Ambiguities at the initial stage of the nonradiative energy transfer in solid state laser materials", Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); doi: 10.1117/12.349221; https://doi.org/10.1117/12.349221

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