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IR-induced photodarkening in Tm-doped fluoride fibres
P.R.Barber, R.Paschotta, A.C.Tropper, and D.C.Hanna
We have observed a new type of infrared-induced photodarkening in high-numerical-aperture fluoride fibers doped with 3000 and 10,000 parts in 106 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.
Optics Letters (1995) Vol.20(21) pp.2195-2197
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