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 1658nm. A maximum output power of 10.4W at 1658.3nm with a spectral linewidth (FWHM) of ∼0.1 nm was obtained for the launched pump power of 18.4W, 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.
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