title: High-average-power operation of a pulsed Raman fiber amplifier at 1686 nm.
abstract: We report on high-average-power operation of a pulsed Raman fiber amplifier at ~1686 nm which cannot be covered by rare-earth-doped fiber lasers. The Raman fiber amplifier was pumped by a home-made 1565.2 nm Q-switched Er,Yb fiber laser and worked at a repetition frequency of 184 kHz. With 0.8 km Raman fiber, 4.4 W of average output power at the 1st order Stokes wavelength of 1686.5 nm was obtained for launched pump power of 16.2 W, corresponding to an optical-to-optical conversion efficiency of 27.2%. Further increasing the pump power, high-order Stokes waves grew gradually, resulting in a total output power of 6.7 W at the 19.2 W launched pump power.
authors.forename: Weichao
authors.initials: W
authors.lastname: Yao
authors.forename: Bihui
authors.initials: B
authors.lastname: Chen
authors.forename: Jianing
authors.initials: J
authors.lastname: Zhang
authors.forename: Yongguang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Deyuan
authors.initials: D
authors.lastname: Shen