Open AccessConcentration quenching in fine-grained ceramic Nd:YAG
Author(s) -
Larry D. Merkle,
Mark Dubinskii,
Kenneth L. Schepler,
S. M. Hegde
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.003893
Subject(s) - ion , excitation , quenching (fluorescence) , materials science , fluorescence , atomic physics , relaxation (psychology) , energy transfer , kinetics , analytical chemistry (journal) , pulse (music) , ceramic , optics , chemistry , physics , psychology , social psychology , organic chemistry , quantum mechanics , chromatography , detector , composite material
We have studied the concentration dependent fluorescence decay kinetics of ceramic Nd:YAG, to resolve inconsistencies in the previous literature. Our data indicate that earlier reports of single exponential lifetimes even at Nd concentrations of a few percent were due to the effects of long-pulse excitation. Under short-pulse excitation the fluorescence decay is nonexponential for concentrations greater than about 1% atomic. Energy migration to sinks consisting of cross-relaxing Nd ions dominates at long times, whereas single-step energy transfer to randomly distributed quenching sites dominates at earlier times. The concentration dependence of this single-step transfer indicates direct cross-relaxation between individual ions at concentrations below 4% atomic, but resonant transfer to quenching sites consisting of Nd pairs at higher concentrations.
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