title: 8.2  kW high beam quality quasi-continuous-wave face-pumped Nd:YAG slab amplifier.
abstract: An 8 kW level quasi-continuous-wave (QCW) face-pumped 1064 nm slab laser with high beam quality was developed by a master oscillator power amplifier (MOPA) system. A single-mode fiber seed laser was amplified by two-stage single-pass Nd:YAG rod preamplifiers and four face-pumped Nd:YAG slab amplifiers. The slab amplifiers were well designed with uniform pumping and uniform cooling for well-distributed thermal and stress. A dynamically feedbacked optical aberration compensation device was employed to correct low-order optical aberration, and the residue high-order optical aberration was corrected by an adaptive optics system. The QCW MOPA delivered up to an average power of 8.2 kW with a pulse duration of 200 μs at a repetition rate of 400 Hz. The beam quality factor was measured to be β=3.5.
authors.forename: Zhong-Zheng
authors.initials: ZZ
authors.lastname: Chen
authors.forename: Yi-Ting
authors.initials: YT
authors.lastname: Xu
authors.forename: Ya-Ding
authors.initials: YD
authors.lastname: Guo
authors.forename: Bao-Shan
authors.initials: BS
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Xu
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Gao
authors.forename: Lei
authors.initials: L
authors.lastname: Yuan
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Yuan
authors.forename: Yan-Yong
authors.initials: YY
authors.lastname: Lin
authors.forename: Yun-Sheng
authors.initials: YS
authors.lastname: Xiao
authors.forename: Yong
authors.initials: Y
authors.lastname: Bo
authors.forename: Qin-Jun
authors.initials: QJ
authors.lastname: Peng
authors.forename: Wen-Qiang
authors.initials: WQ
authors.lastname: Lei
authors.forename: Da-Fu
authors.initials: DF
authors.lastname: Cui
authors.forename: Zu-Yan
authors.initials: ZY
authors.lastname: Xu