To ensure sufficient absorption of tandem-pumping energy, a large-scale aluminophosphosilicate fiber with 55 μm core and 400 μm inner-clad in diameter, i.e., a 55/400 Yb-APS fiber, was experimentally fabricated by using modified chemical vapor deposition system combining with chelate precursor doping technique. Based on an all-fiberized master oscillator power-amplifier laser setup tandem-pumped by 1018 nm fibber laser, a 150 W 1080 nm seed was amplified to 11.18 kW successfully, along with an optical-to-optical efficiency of 79.7%.
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