title: 3.15 kW direct diode-pumped near diffraction-limited all-fiber-integrated fiber laser.
abstract: We demonstrate a direct diode-pumped all-fiber-integrated fiber laser based on master oscillator power amplifier configuration at 1080 nm, producing maximum output power of 3.15 kW with corresponding optical to optical efficiency of 75.1%. Further power scaling is pump-limited and theoretical analysis demonstrates that 4 kW output power can be further achieved without stimulated Raman scattering. Near diffraction-limited beam quality (M(2) ~ 1.6 in the x and y directions) is also achieved at the maximum output power. This compact prototype laser has excellent stability and reliability, which could benefit many practical applications, such as industrial processing.
authors.forename: Hailong
authors.initials: H
authors.lastname: Yu
authors.forename: Hanwei
authors.initials: H
authors.lastname: Zhang
authors.forename: Haibin
authors.initials: H
authors.lastname: Lv
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.forename: Jinyong
authors.initials: J
authors.lastname: Leng
authors.forename: Hu
authors.initials: H
authors.lastname: Xiao
authors.forename: Shaofeng
authors.initials: S
authors.lastname: Guo
authors.forename: Pu
authors.initials: P
authors.lastname: Zhou
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Xu
authors.forename: Jinbao
authors.initials: J
authors.lastname: Chen