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A pulse master-oscillator fiber power amplifier system with china-made large-mode-area fiber and a (6+1)×1 multimode combiner is demonstrated. The system generates up to 4.8W of amplified radiation (100kHz) at a wavelength of 1064nm with a near-diffraction-limited beam quality (M 2 =1.2), and the overall slope efficiency with respect to the launched pump power is 50%. Some basic characteristics...
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