2.4 kW 1045 nm narrow-spectral-width monolithic single-mode CW fiber laser by using an FBG-based MOPA configuration

摘要

A 24 kW narrow-spectral-width near-diffraction-limited monolithic fiber laser system at similar to 1045.2 nm in a fiber Bragg grating (FBG)-based master oscillator power amplifier (MOPA) configuration is demonstrated in this paper. The near-diffraction-limited beam quality (M-2 similar to 1.2) and a spectral width of 0.35 nm (similar to 96 GHz) are achieved. The stimulated Raman scattering (SRS) is theoretically and experimentally investigated. The SRS has been suppressed by carefully optimizing the length of the Yb-doped fiber and the pumping scheme, and a signal-to-noise ratio of similar to 33 dB between the laser signal and the Raman Stokes component is achieved. The stimulate Brillouin scattering and the transverse mode instability are not observed. To our best knowledge, this is the highest-output power for 104 x nm single-mode fiber laser with similar to 96 GHz spectral width by using an FBG-based MOPA configuration. (C) 2021 Optical Society of America