IR-induced photodarkening in Tm-doped fluoride fibres

Abstract

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

doi: 10.1364/OL.20.002195

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