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Proceedings Paper

Ambiguities at the initial stage of the nonradiative energy transfer in solid state laser materials
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Paper Abstract

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.

Paper Details

Date Published: 26 May 1999
PDF: 9 pages
Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); doi: 10.1117/12.349221
Show Author Affiliations
Luis A. Diaz-Torres, Ctr.de Investigaciones en Optica A.C. (Mexico)
David S. Sumida, HRL Labs., LLC (United States)
Oracio Barbosa-Garcia, Ctr. de Investigaciones en Optica A.C. (Mexico)
M. Antonio Meneses-Nava, Ctr. de Investigaciones en Optica A.C. (Mexico)


Published in SPIE Proceedings Vol. 3610:
Laser Material Crystal Growth and Nonlinear Materials and Devices
Kathleen I. Schaffers; Lawrence E. Myers, Editor(s)

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