Paschotta, R., Nilsson, J., Barber, P.R., Caplen, J.E., Tropper, A.C. and Hanna, D.C.
Lifetime quenching in Yb doped fibres
Optics Communications, 136, (5-6), . (doi:10.1016/S0030-4018(96)00720-1).
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.
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