In this paper, we reported both the experimental demonstration and theoretical analysis of a Raman fiber laser based on a master-oscillator-power-amplifier configuration. The Raman fiber laser adopted the dual-wavelength bidirectional pumping configuration, utilizing 976 nm laser diodes and 1018 nm fiber lasers as the pump sources. A 60-meter-long 25/400 μm ytterbium -doped fiber was used to convert the power from 1070 to 1124 nm, realizing a maximum power output of 3.7 kW with a 3 dB spectral width of 6.8 nm. Moreover, we developed a multi-frequency model taking into consideration the Raman gain spectrum and amplified spontaneous emission. The calculated spectral broadening of both the forward and backward laser was in good agreement with the experimental results. Finally, a 1.5 kW, 1183 nm second-order Raman fiber laser was further experimentally demonstrated by the addition of a 70-meter-long germanium-doped passive fiber.
Wang Zehui, Xiao Qirong, Huang Yusheng, TIAN JIADING, Li Dan, Yan Ping, Gong Mali. Dual-wavelength bidirectional pumped high-power Raman fiber laser[J]. High Power Laser Science and Engineering, , (): .
