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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 21, Iss. 10 — Oct. 1, 2004
  • pp: 1740–1748

Secondary energy transfer and nonparticipatory Yb3+ ions in Er3+-Yb3+ high-power amplifier fibers

George A. Sefler, W. Daniel Mack, George C. Valley, and Todd S. Rose  »View Author Affiliations


JOSA B, Vol. 21, Issue 10, pp. 1740-1748 (2004)
http://dx.doi.org/10.1364/JOSAB.21.001740


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Abstract

The energy exchange processes within Er<sup>3+</sup>–Yb<sup>3+</sup>-codoped silica fibers manufactured for high-power optical amplifiers are investigated through luminescent decay measurements and rate-equation modeling. The Er<sup>3+</sup> and Yb<sup>3+</sup> luminescence, as functions of pump power, exhibit an unquenchable Yb<sup>3+</sup> to Er<sup>3+</sup> cooperative energy transfer (CET) that does not subside with saturation of the Er<sup>3+</sup> inversion. Consistent with the experimental results is the occurrence of secondary energy transfer to excited Er<sup>3+</sup> ions in their metastable <sup>4</sup>I<sub>13/2</sub> state. The transfer coefficient for this secondary <sup>4</sup>I<sub>13/2</sub> CET is determined to be of the same order of magnitude as that for the initial Yb<sup>3+</sup> to ground-state Er<sup>3+</sup> CET. Additionally, the decay measurements and modeling indicate that a fraction of Yb<sup>3+</sup> ions does not participate in energy exchange with the Er<sup>3+</sup>. These nonparticipatory Yb<sup>3+</sup> ions amounted to ~15% of the total Yb<sup>3+</sup> concentration and could constitute Yb<sup>3+</sup> clusters. Both secondary CET and nonparticipatory Yb<sup>3+</sup> will lower Er<sup>3+</sup>–Yb<sup>3+</sup> fiber amplifier efficiencies.

© 2004 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.2410) Fiber optics and optical communications : Fibers, erbium
(160.5690) Materials : Rare-earth-doped materials

Citation
George A. Sefler, W. Daniel Mack, George C. Valley, and Todd S. Rose, "Secondary energy transfer and nonparticipatory Yb3+ ions in Er3+-Yb3+ high-power amplifier fibers," J. Opt. Soc. Am. B 21, 1740-1748 (2004)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-21-10-1740

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