Efficient single-frequency fiber lasers with novel photosensitive Er/Yb optical fibers.
Boron- and germanium-doped highly photosensitive cladding is used in a novel design to achieve photosensitive Er/Yb-doped fibers, permitting short, strong gratings (length approximately 1 cm, reflectivity >99%) to be written without hydrogenation. The high absorption at 980 nm in Er/Yb fibers permits efficient pump absorption over a short device length, which is ideal for achieving highly efficient single-frequency fiber lasers. Both single-frequency Bragg-grating reflector and distributed-feedback lasers with slope efficiencies of 25% with respect to launched pump power have been realized in such fibers.
Dong
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L
Optoelectronics Research Centre, The University of Southampton, Southampton SO17 1BJ, UK.
Loh
W H
WH
Caplen
J E
JE
Minelly
J D
JD
Hsu
K
K
Reekie
L
L