Abstract
Power scaling potential with record high efficiency for a resonantly (in-band) cladding-pumped Yb-free Er-doped eye-safe fibre laser utilising the fibre with non-clustering composition and increased cladding pump absorption is domonstrated. While pumping at 1532.5 nm by power-combined fibre-coupled spectrally-narrowed InGaAsP/InP diode laser modules, ∼47 W of continuous-wave multimode output power at ∼1590 nm with optical-to-optical efficiency over 77% were achieved. To the best of the authors' knowledge, this is the highest efficiency ever obtained from a cladding-pumped Yb-free Er-doped fibre laser.
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