Abstract
Yb/P/Al codoped silica glass preforms are fabricated by MCVD process combined with the solution doping technique.Highly and homogeneously doping of Yb3+ is realized by optimization of the core composition and fabrication process.The Yb2O3 concentration in preform core is up to ~4 wt.% and Yb3+ fluorescence lifetime at 1080nm reaches 1 780 μs.Double-clad fibers with octagonal inner cladding are successfully drawn from the preform,the fiber core diameter is 7.5 μm and the clad absorption coefficicent is up to ~5 dB/m@976 nm.The operation of the cladding pumped all-fiber laser is demonstrated using Yb-doped double-clad fibers.Fiber lasers with output power of 5.15 W and slope efficiency of 76% are obtained.
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