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Results on a 1.6μm semiconductor diode pumped thulium fibre laser operating in the 1.9μm region are presented for the first time. A minimum threshold of 0.60mW and a maxmum slope efficiency of 80% with respect to launched pump power have been observed. In addition gain values of 14.5dB have been achieved for 2.98 mW of launched pump power indicating that a gain efficiency of 4.9dB/mW is possible.
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Percival et al. (1993) studied this question.
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