Energy transfer up--conversion in Tm(3)(+)--doped silica fiber

A study of the mechanisms responsible for the infra-red to near infra-red up-conversion in Tm3+-doped silica fibers is presented. Up-conversion luminescence was observed from the3H4 level of Tm3+under 1586nm pumping into the3F4 level. The quadratic dependence of the up-conversion luminescence at 800...

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Veröffentlicht in:Journal of non-crystalline solids 2006-02, Vol.352 (2), p.136-141
Hauptverfasser: Simpson, D A, Baxter, G W, Collins, S F, Gibbs, W E K, Blanc, W, Dussardier, B, Monnom, G
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Sprache:eng
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Zusammenfassung:A study of the mechanisms responsible for the infra-red to near infra-red up-conversion in Tm3+-doped silica fibers is presented. Up-conversion luminescence was observed from the3H4 level of Tm3+under 1586nm pumping into the3F4 level. The quadratic dependence of the up-conversion luminescence at 800nm on the 1800nm luminescence from the3F4 level confirms that the3H4 level is populated by a two photon process. Two possible processes are proposed as mechanisms responsible for the up-conversion: excited state absorption and energy transfer up-conversion. The decay characteristics of the luminescence from the3H4 level were studied under direct and indirect pumping at 786 and 1586nm, respectively. By comparing the decay waveforms to the solution of a simple set of rate equations, the energy transfer up-conversion process (3F4,3F4- > 3H4,3H6) was established at Tm2O3 concentrations greater than 200ppm.
ISSN:0022-3093
DOI:10.1016/j.jnoncrysol.2005.11.019