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Observation of spatial migration of excitation in Er-doped optical fibers by means of a population grating technique

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Abstract

The influence of spatial migration of excitation among neighboring Er3+ ions on the dynamics of population grating formation in Er-doped optical fibers is reported. The effect manifests itself in an additional increment in the grating formation rate compared with the fluorescence growth rate observed for the same spatially uniform average light power. The experiments, performed at λ=1549nm in the configuration of transient two-wave mixing with two similar single-mode Er-doped fibers with significantly different erbium concentrations (640 and 5600 parts in 106), demonstrated the essential contribution of this effect to the grating formation rate in the latter fiber. The evaluated diffusion coefficient proved to be 2.3×109cm2s, which ensures effective migration of the excitation by 48nm, i.e., by 18 average inter-ion distances in this fiber.

© 2005 Optical Society of America

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