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Opt Express. 2013 Mar 25;21(6):7590-8. doi: 10.1364/OE.21.007590.

Evidence of Tm impact in low-photodarkening Yb-doped fibers.

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


In contrast to Yb/Al-doped fibers, the influence of very low Tm(2)O(3) concentrations (≥ 0.1 mol-ppm) on photodarkening (PD) is clearly detectable in Yb/P-doped fibers that are known to show little degradation effects. For Tm(2)O(3) additions of more than 50 mol-ppm, the measured PD loss is even similar to Yb/Al-doped fibers with comparable rare earth concentrations. Our work reveals the risk of color center generation by pumping at wavelengths of 915 nm or 976 nm even in Al-free Yb-doped fibers and emphasizes the importance of high purity of raw materials for the preparation of Yb laser fibers with expected very low PD.

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