In this work, to scale laser power while suppressing NL effects, we designed and fabricated a fiber triple-clad Ytterbium doped fiber with large core diameter by using MCVD combined with all-gas-phase doping method. To modify the PD performance of the fiber, P、Al and F were co-doped in the fiber. An excellent laser performance could be demonstrated for such a fiber with an output power of more than 10 kW and a slope efficiency of 82%. Long-term laser stability at 10 kW-level was carried out in a master oscillator power amplifier (MOPA) laser system for 500 hours with power degradation less than 1%.
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