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An ytterbium-sensitised thulium-doped silica fibre laser that generates up to 75 W of output power in the 2 µm wavelength range when cladding-pumped by a 975 nm diode stack is reported. The slope efficiency is 32% with respect to the launched pump power and the beam quality factor (M2) is 1.3.
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Jeong et al. (2005) studied this question.
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