title: 83.4  W, 17.69  kHz spectral bandwidth, continuous-wave, beam densely folded Innoslab amplifier.
abstract: Combined with the advantages of the narrow bandwidth of a non-planar ring oscillator seed laser and the structure of a direct pumped Innoslab amplifier, a high-efficiency and high-power continuous-wave (CW) single-frequency laser was obtained by densely folding the seed laser beam in an Innoslab amplifier with a wedged multi-folded configuration. A maximum output power of 83.4 W of a single-frequency amplifier with a bandwidth of 17.69 kHz was obtained under a pump power of 234 W, corresponding to an optical-to-optical conversion efficiency of 33.2%. The beam quality factor M2at the maximum output power in horizontal and vertical directions was measured to be 1.15 and 1.24, respectively. The long-term power instability in 2 h was less than 1.63%.
authors.forename: Jian
authors.initials: J
authors.lastname: Ning
authors.forename: Kezhen
authors.initials: K
authors.lastname: Han
authors.forename: Jingliang
authors.initials: J
authors.lastname: He
authors.forename: Yiran
authors.initials: Y
authors.lastname: Wang
authors.forename: Hongkun
authors.initials: H
authors.lastname: Nie
authors.forename: Haikun
authors.initials: H
authors.lastname: Zhang
authors.forename: Baitao
authors.initials: B
authors.lastname: Zhang
authors.forename: Kejian
authors.initials: K
authors.lastname: Yang
authors.forename: Ruihua
authors.initials: R
authors.lastname: Wang