title: Volume Bragg grating narrowed high-power and highly efficient cladding-pumped Raman fiber laser.
abstract: High-power and highly efficient operation of a single-mode cladding-pumped Raman fiber laser with narrow lasing bandwidth is demonstrated. The spectral narrowing was realized by an external cavity containing a volume Bragg grating with a center wavelength of 1658 nm. A maximum output power of 10.4 W at 1658.3 nm with a spectral linewidth (FWHM) of ∼0.1  nm was obtained for the launched pump power of 18.4 W, corresponding to a slope efficiency of 109% with respect to the launched pump power. Lasing characteristics of free-running operation are also evaluated and discussed.
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Weichao
authors.initials: W
authors.lastname: Yao
authors.forename: Chujun
authors.initials: C
authors.lastname: Zhao
authors.forename: Deyuan
authors.initials: D
authors.lastname: Shen
authors.forename: Dianyuan
authors.initials: D
authors.lastname: Fan