LD-pumped 6 W cw Tm3+-doped silica double-cladding fibre laser

摘要

We report a thulium-doped silica fibre laser that generates a maximum cw output power of 6 W in a 2 mu m wavelength range when cladding-pumped by a laser diode (LD) operating at approximately 791 nm at room temperature. The slope efficiency with respect to the launched pump power is 50% and 38.4%, with and without an output coupler mirror, respectively. The corresponding thresholds are 2.8 W and 4.8 W, respectively. The beam qualities M-x(2) and M-y(2) are 1.26 and 1.32, respectively. The experimental results are also analysed.