Abstract
The fundamental characteristics of Fabry–Perot-cavity continuous-waveTm–Ho codoped silica fibre lasers pumped by a 1.18 μm Raman fibre laserare presented. A maximum output power of 930 mW at 1880 nm is generatedfor a fibre length of 1 m from the transition of Tm3+, with aslope efficiency of 32.4%. For a 3-m-long fibre, the maximum outputpower decreases to 650 mW at 1960 nm due to the laser emission fromHo3+ with a lower slope efficiency of 25%, which clearly showsthe effective energy transfer from Tm3+ to Ho3+. Thewavelength red-shifting of the laser emission originates from thetransition competition and the emission cross section differencebetween Tm3+ and Ho3+.
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