Barber, P.R., Paschotta, R., Tropper, A.C. and Hanna, D.C.
IR-induced photodarkening in Tm-doped fluoride fibres
Optics Letters, 20, (21), . (doi:10.1364/OL.20.002195).
We have observed a new type of infrared-induced photodarkening in high-numerical-aperture fluoride fibers doped with 3000 and 10,000 parts in 10^6 by weight of Tm. The loss induced in the visible region by 1140-nm radiation is very strong (as high as 25 dB in a 50-cm piece) and broadband it can be removed by irradiation with the same pump wavelength at lower powers.
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