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Lifetime quenching in Yb doped fibres
R.Paschotta, J.Nilsson, P.R.Barber, J.E.Caplen, A.C.Tropper and D.C.Hanna
We have discovered that in ytterbium-doped silica fibres the excited state lifetime of a fraction of the Yb ions can be quenched to a very small value, leading to a strong unbleachable loss. This unexpected behaviour seems to be caused by some, yet unidentified, impurity or structural defect. It is of considerable relevance for various Yb doped lasers and-amplifiers including Er:Yb codoped fibres as used in telecommunication amplifiers although it should also be emphasized that fibres can be produced that are free from the quenching effect.
Optics Communications (1997) Vol.136(5-6) pp.375-378
Copyright University of Southampton 2006