22 March 2013 Strong excited state absorption (ESA) in Yb-doped fiber lasers
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Excited state absorption (ESA) measurements performed on Yb-doped silica bers show the onset of a strong absorption band in the visible range. In this work, we perform experiments to investigate the possibility for ESA to be part of the induced optical losses (photodarkening) observed in Yb-doped ber lasers. Our results indicate that an ESA process, from the 2F5/2 excited state manifold in the Yb3+ ion to the charge-transfer state with absorption bands in the UV range, may constitute a transfer route for pump- and laser photons in the near-infrared range.
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Magnus Engholm, Magnus Engholm, Sara Rydberg, Sara Rydberg, Krister Hammarling, Krister Hammarling, "Strong excited state absorption (ESA) in Yb-doped fiber lasers", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86010P (22 March 2013); doi: 10.1117/12.2002957; https://doi.org/10.1117/12.2002957

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