Efficient silica-based Ho 3+ fibre laserfor 2 µm spectral regionpumped at 1.15 µm

For the first time an Ho3+ silica fibre laser has been realised using a Bragg grating as the input coupler and a fibre pump source at 1.15 µm. The output power of 280 mW at 2 µm is to the authors' knowledge the highest value reported so far for Ho3+ silica fibre lasers.