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Results are presented, for the first time, regarding the spectroscopy and the laser performance of a fluorozirconate fibre codoped with thulium and terbium (0.1%:1%). This doping scheme relies on concentration induced cross-relaxation effects to relieve population bottlenecked in Tm /sup 3/H/sub 4/ to Tb /sup 7/F/sub 0/. A minimum threshold of 5.5 mW and a maximum slope efficiency of 16% with respect...
CW operation of extremely high efficiency has been observed from the 2.024 mu m transition of holmium in a Tm:Ho codoped singlemode fluoride fibre laser. By pumping into thulium absorption between 820 and 830 nm, output powers of 250 mW and maximum slope efficiencies of 60% were observed. These results suggest that pump quantum, and photon conversion efficiencies of 150 and 75% respectively, are readily...
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