We report the fabrication of a master oscillator power-amplifier (MOPA) 340W continuous-wave fiber laser. In
the two-stage MOPA configuration the 100W power of master oscillator at 1090nm wavelength is amplified by
Yb-doped large-mode-area fibers as the power amplifiers medium which are pumped by six 30W laser diodes in
each stage. 20/400μm double cladding Yb-doped fiber was used for making the master oscillator and two other
stages. For enhancing the long term reliability of the system and minimizing its loss at splices several tests were
conducted (e.g various thermal pastes and mode stripping methods were used). In conclusion the optical
efficiency of the MOPA is about 69% and the output power stability is ±0.5% within around 100 hours
measuring time.
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