title: Ytterbium-doped large-mode-area silica fiber fabricated by using chelate precursor doping technique.
abstract: We reported on a highly effective chelate precursor doping technique for Yb-doped large-mode-area (LMA) fiber manufacture. By accurately controlling the evaporation temperature and flow rate of carrier gas, the chelate precursor doping technique is capable of making Yb-doped LMA silica fiber with good uniformity free of center dip, low numerical aperture of ~0.056, large preform core size of 4.46 mm, and appropriate cladding absorption of 1.17  dB/m at 976.4 nm. Based on a single-end-pump all-fiber oscillator laser setup, the laser output at 1080 nm reached 700 W with slope efficiency of 54.2%.
authors.forename: Tengfei
authors.initials: T
authors.lastname: Shi
authors.forename: Zhiguang
authors.initials: Z
authors.lastname: Zhou
authors.forename: Li
authors.initials: L
authors.lastname: Ni
authors.forename: Xusheng
authors.initials: X
authors.lastname: Xiao
authors.forename: Huan
authors.initials: H
authors.lastname: Zhan
authors.forename: Aidong
authors.initials: A
authors.lastname: Zhang
authors.forename: Aoxiang
authors.initials: A
authors.lastname: Lin