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High power resonantly pumped holmium-doped fibre sources

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High power resonantly pumped holmium-doped fibre sources

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  • Author: Alexander Hemming, Nikita Simakov, John Haub, Adrian Carter
Laser sources operating in the spectral region beyond 2 µm are of interest for a range of applications in the areas of remote sensing, medicine, industrial materials processing and defence. These applications require a diverse range of sources of various temporal, spectral and output power levels to meet their requirements. The operation of silica fiber lasers at 2 µm has advantages in terms of the suppression of non-linear effects such as stimulated Brillouin and Raman scattering which can limit high power operation of fibre based devices. The majority of silica fibre based sources developed for the 2 µm spectral region have used thulium fibres. Various pulsed sources have been realised, including Q-switched, gain switched and mode-locked lasers. CW thulium sources have been demonstrated at more than 1 kW of output power with excellent beam quality, as well as narrow line-width operation producing 608 W of output power.

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