High-power thulium-doped fibre laser with intracavity dispersion management

This paper reports a scheme for the generation and amplification of pico- and femtosecond pulses in the range 1.93—1.97 μm using thulium-doped silica fibres. Group velocity dispersion (GVD) management in the cavity of the thulium-doped fibre laser oscillator is ensured by a single-mode germanosilicate fibre (75 mol % GeO₂ in the core) with a positive GVD. Pulses are obtained down to 200 fs in duration and up to 56 nJ in energy.