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Opt Express. 2011 Jul 18;19(15):14473-8. doi: 10.1364/OE.19.014473.

Influence of Tm- or Er-codoping on the photodarkening kinetics in Yb fibers.

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  • 1Institute of Photonic Technology, Albert-Einstein-Str 9, 07745 Jena, Germany.


We investigated photodarkening (PD) parameters of Yb/Al-doped silica fibers as a function of the concentration of additional rare earth ions like Tm or Er. It was found that both Tm and Er cause a decrease in Yb inversion followed by a reduction of PD in the case of Er, whereas Tm-codoping with more than 10 mol-ppm can strongly accelerate the process and also increase the PD loss. However, contrary to [1], we conclude that the typical PD behavior of Yb/Al fibers is an intrinsic feature of this fiber type and not caused by trace impurities of Tm (< 1 mol-ppm) unintentionally incorporated by the raw materials during fiber preparation.

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