Abstract
The operation of a 2.31 mu m CW thulium-doped fibre laser, pumped by a low power 785nm diode-laser is reported. A 2 mW output power combined with a high slope efficiency make this fibre laser ideal for sensing hydrocarbon gases, which absorb at 2.31 mu m. A limit of detection of approximately 1000 ppm metres for methane is demonstrated using an unoptimised system.< >
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