Abstract
We report a all-fibre Tm-doped fibre laser using a composite cavity with a centre wavelength of . The composite cavity consists of two interferometric laser arms that are efficiently combined. Each interferometric laser arm contains a double-clad Tm-doped silica fibre operating in cw mode and pumped by pigtailed laser diodes with a centre wavelength of . A high combining efficiency of 93.9 % and a narrow linewidth of are obtained. The output power of the laser can be scaled straight forwardly by improving the pump power and optimising the component parameters at .
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