A 340 W monolithically integrated all-fiber laser design using the Master Oscillator Power Amplifier Configuration

摘要

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. 20/400um 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.