LAUSR

Abstract In this paper, a more-than ten-Watt all-fiber oscillator operating near 980nm is demonstrated with a commercially-available 20/125-μm double-cladding Yb-doped fiber (DCYF) firstly, to the best of our knowledge. The 15-W output power is eventually obtained with the slope efficiency of 13% and central wavelength around 978 nm. Moreover, the power scalability of the 980-nm fiber oscillator is also investigated numerically. It is revealed that more-than 20% slope efficiency can be obtained with this kind of DCYF. It is also found that besides pump power, the cladding light stripper (CLS) is another limitation in the 980-nm fiber oscillator, and more-than 50-W output power can be obtained if more-than 80-W residual pump light can be filter out with each CLS.