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  • Received: May. 12, 2020

    Accepted: Jun. 28, 2020

    Posted: Aug. 28, 2020

    Published Online: Sep. 3, 2020

    The Author Email: Pu Zhou (zhoupu203@163.com)

    DOI: 10.3788/COL202018.101403

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    Hongxiang Chang, Jiachao Xi, Rongtao Su, Pengfei Ma, Yanxing Ma, Pu Zhou. Efficient phase-locking of 60 fiber lasers by stochastic parallel gradient descent algorithm[J]. Chinese Optics Letters, 2020, 18(10): 101403

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Chinese Optics Letters, Vol. 18, Issue 10, 101403 (2020)

Efficient phase-locking of 60 fiber lasers by stochastic parallel gradient descent algorithm

Hongxiang Chang, Jiachao Xi, Rongtao Su, Pengfei Ma, Yanxing Ma, and Pu Zhou*

Author Affiliations

  • College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

Abstract

Coherent beam combining of 60 fiber lasers by using the stochastic parallel gradient descent algorithm has been demonstrated. The functions of pinhole(s) on the power distributions in the far-field have been systematically simulated on both in-phase and out-of-phase modes. Only one photoelectric detector was used to detect the combined power in the far-field central lobe of the in-phase mode state. When the phase controller was in a closed loop, the contrast of the far-field intensity pattern was as high as ~97% with residual phase error of λ/30, and ~34.7% of the total power was contained in the central lobe.

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