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Simple and compact all-fibre retro-reflector for cladding-pumped fibre lasers
Y.Jeong, S.Baek*, J.Nilsson and B.Lee*
Optoelectronics Research Centre, University of Southampton, UK
* School of Electrical Engineering, Seoul National University, Kwanak-Gu Shinlim-Dong, Seoul 151-744, Korea
Proposed is an all-fibre retro-reflector realised via shaping a fibre end into a right-angled cone for a pump reflector in cladding-pumped fibre lasers. The conical-shaped fibre-optic retro-reflector allows folded, total internal reflections for pump beams that propagate in the inner cladding of a double-clad fibre. The proposed scheme was applied to a cladding-pumped ytterbium-doped fibre laser and readily achieved over 55% of reflection for the unabsorbed pump throughput, thereby generating 29% more signal output power than without the pump retro-reflector.
Electronics Letters (2006) Vol.42(1) pp.15-16
Copyright University of Southampton 2006