Efficient Single Frequency Fibre Lasers Using Novel Photosensitive ErYYb Optical Fibres
نویسندگان
چکیده
Boron and germanium doped highly photosensitive cladding is used in a novel design to achieve photosensitive Er/Yb doped fibres, enabling short strong gratings (length = 1 cm, reflectivity > 99%) to be written without hydrogenation. The high absorption at 980 nm in Er/Yb fibres allows efficient pump absorption over a short device length, ideal for achieving highly efficient single frequency fibre lasers. Both single frequency Bragg grating reflector and distributed feedback lasers with slope efficiencies of 25% with respect to launched pump power have been realised in such fibres. ‘,.
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