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A near theoretical maximum slope efficiency of 37% (90% photon conversion) has been demonstrated at 1.925 mu m by forcing simultaneous operation of the 1.82 and 2.31 mu m transitions in a thulium-doped ZBLAN fibre. In addition significant amounts of tunable output power, >30 mW, have been observed over a range of 40 nm from 1.818 to 1.858 mu m for a launched pump power of 183 mW.<<ETX>>
The 1.475 mu m selfterminating transition in a thulium-doped fluorozirconate fibre has been operated CW with thresholds as low as 3.2 mW of launched pump power. Furthermore, by enforcing oscillation at 1.475 and 1.88 mu m simultaneously, output powers of approximately 130 and approximately 115 mW, respectively, have been observed for around 325 mW of launched pump power. These results correspond to...
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