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Published on: November 22, 2019
High power operation of cladding pumped holmium-doped silica fibre lasers
Alexander Hemming1, Shayne Bennetts, Nikita Simakov
1Electro-Optic Technology Group, Electronic Warfare and Radar Division, Defence Science and Technology Organisation, Edinburgh, SA 5111, Australia. alexander.hemming@dsto.defence.gov.au
Abstract:
We report the highest power operation of a resonantly cladding-pumped, holmium-doped silica fibre laser. The cladding pumped all-glass fibre utilises a fluorine doped glass layer to provide low loss cladding guidance of the 1.95 µm pump radiation. The operation of both single mode and large-mode area fibre lasers was demonstrated, with up to 140 W of output power achieved. A slope efficiency of 59% versus launched pump power was demonstrated. The free running emission was measured to be 2.12-2.15 µm demonstrating the potential of this architecture to address the long wavelength operation of silica based fibre lasers with high efficiency.
