A cost-effective 46.9 W diffraction-limited all-fiber laser at 980 nm was demonstrated with a 20/80-μm octagonal double-cladding Yb-doped fiber under direct pumping of low-cost 915 nm laser diode. The slope efficiency is about 24% and the center wavelength is 977 nm. The beam quality M2 factor is measured to be 1.30 (Mx2 = 1.40, My2 = 1.19). The amplified spontaneous emission at 1030 nm is about 50 dB lower spectrally at the maximum output power. To understand the laser generation process and optimize the output performance, we investigated the effect of gain fiber length on the output power characteristics both experimentally and theoretically. The experimental results are consistent with the simulation.
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