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 $100\mathrm{W}$ by using three-stage cascaded amplification. The two laser beams are actively phase-locked with a total average power of $215.8\mathrm{W}$, producing $\sim 8\mathrm{ns}$ pulses at $10\mathrm{MHz}$ repetition rate. The contrast of the far-field intensity pattern of the coherently combined beam is more than 83%.

©2012 Optical Society of America

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