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Continuous-wave operation of a double-clad Tm-doped silica fibre laser at 2 µm, pumped by two beam-shaped diode bars, yielded an output power of 14 W in a singlemode (M2 < 1.1) beam for 36.5 W of launched pump power at 787 nm. The slope efficiency with respect to launched diode power was ~46%.
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Hayward et al. (2000) studied this question.
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