Dong, L., Loh, W.H., Caplen, J.E., Minelly, J.D., Hsu, K. and Reekie, L.
Efficient single frequency fibre lasers using novel photosensitive Er/Yb optical fibres
Optics Letters, 22, (10), . (doi:10.1364/OL.22.000694).
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 ~1cm, reflectivity >99%) to be written without hydrogenation. The high absorption at 980nm 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
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