Abstract
Numerical simulations have, for the first time to our knowledge, been carried out to characterize theYb3 + –Tm3 + co-doped silica fibre laser (YTFL), defined by a fibre grating and an end mirror, by usingthe rate equations, which take into consideration both the energy transfer processes fromYb3 + toTm3 + ions and the cross-relaxation processes among differentTm3 + ions. A dual-wavelength pumping scheme with one at 805 nm and the other at 975 nm is usedto pump the YTFL. We have investigated the wavelength-dependent output power ofthe YTFL, from 1750 to 2200 nm, which takes its maximum output power at ∼ 1800 nm. The effect of the cross-relaxation processes in theTm3 + -doped silica fibre laser has been studied. The results indicate that these processes are beneficialto the laser and should be considered in the theoretical modelling. The influence of theYb3 + concentration on the characteristics of the YTFL has also been analysed and the results show thatYb3 + dopants can improve the output power and slope efficiency of the laser.
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