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Active coherent beam combination of two high-power single-frequency nanosecond fiber amplifiers
Rongtao Su1, Pu Zhou, Xiaolin Wang
1College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha, China.
Abstract:
We report on active coherent beam combining of two single-frequency nanosecond fiber amplifiers by using stochastic parallel gradient descent algorithm. Each fiber amplifier produces an average power of more than 100 W by using three-stage cascaded amplification. The two laser beams are actively phase-locked with a total average power of 215.8 W, producing ~8 ns pulses at 10 MHz repetition rate. The contrast of the far-field intensity pattern of the coherently combined beam is more than 83%.
