The three-electron bond =Si<O2:·Yb absorption center of pre-darkened ytterbium-doped silica

Kent Erik Mattsson

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    Abstract

    The formation and bleaching of color centers during annealing of pre-darkened ytterbium-doped silica fibers is modeled by three-electron bond (TEB) = Si<O2:∙Yb absorption centers. The nature of a center and underlying mechanism for its annealing in formation, shift and dissociation of chemical bonds is described in terms of a Markov statistical model with state change set by Bose-Einstein phonon statistics. The center hold one terminal and four active states with activation energies for transitions among these found to match bond energies of molecular oxygen in ionic character bonds of 1 and 1½ bond order. Experimentally observed in- and decrease in absorption during ramp and isothermal annealing of pre-darkened ytterbium co-doped silica fibers are hereby matched by a set of = Si<O2:∙Yb centers
    Original languageEnglish
    JournalOptics Express
    Volume21
    Issue number10
    Pages (from-to)12849-12864
    ISSN1094-4087
    DOIs
    Publication statusPublished - 2013

    Bibliographical note

    This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-10-12849. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

    Keywords

    • Activation energy
    • Chemical bonds
    • Color centers
    • Isothermal annealing
    • Silica
    • Silicon
    • Statistical mechanics
    • Ytterbium

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