Active coherent beam combination of two high-power single-frequency nanosecond fiber amplifiers

Optics Letters
Rongtao SuXiaojun Xu

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%.

References

Apr 3, 2009·Optics Letters·Baishi WangAnthony Sanchez
Jan 15, 1994·Optics Letters·J R LegerZ Wang
Jan 5, 2011·Optics Express·Enrico SeiseAndreas Tünnermann
Sep 22, 2011·Optics Express·Jérome BourderionnetArnaud Brignon
Oct 4, 2011·Optics Letters·Enrico SeiseAndreas Tünnermann

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