Concept of utilizing W-type GeO2-doped silica fiber for high power coherent supercontinuum (SC) is firstly proposed. We reveal how the core diameter, inner cladding diameter and GeO2 doped content of outer cladding dramatically influence dispersion characteristics of W-type fibers. W-type fiber with outer cladding of 80 % GeO2 doped silica and 5 μm core diameter can achieve all normal dispersion (ANDi) from 1.2 to 2.8 μm, and the fiber with such large core diameter can withstand high power SC. SC are numerically simulated in the W-type fiber pumped with femtosecond pulse at 1960 and 1560 nm. The results suggest that the fiber can produce SC with high coherence spanning from 1020 to 2530 nm. The Wtype silica fiber not only enables high power coherent SC generation in the near-infrared range but also facilitates the implementation of an all-fiber system.
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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