We demonstrates all-fiber master oscillator – power amplifier delivered 70W output power at 1033.33nm with 8 kHz FWHM linewidth without any problems with SBS. The anisotropic ytterbium doped tapered double clad amplifier with 50 μm MFD and polarization extinction ratio about 30 dB is developed as a burst stage. The output radiation demonstrated perfect beam quality (M2=1.03/1.08).
Teppo Noronen, Andrei Fedotov, Joona Rissanen, Regina Gumenyuk, Oleg Butov, Yuri Chamorovskii, Konstantin Golant, Maxim Odnoblyudov, and Valery Filippov, "Ultra-large mode area single frequency anisotropic MOPA with double clad Yb-doped tapered fiber," Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121T (Presented at SPIE LASE: February 01, 2018; Published: 26 February 2018); https://doi.org/10.1117/12.2288942.
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