High Power Laser and Particle Beams, Volume. 36, Issue 6, 061001(2024)

Progress in active phase control for large-scale coherent laser beam combining

Hongbing Zhou1...2, Haoyu Zhang1, Min Li1, Xi Feng1, Lianghua Xie1, Yu Liu1, Qiuhui Chu1, Yuefang Yan1, Rumao Tao1,*, Honghuan Lin1, Jianjun Wang1, Lixin Yan2 and Feng Jing1 |Show fewer author(s)
Author Affiliations
  • 1Laser Fusion Research Center, CAEP, Mianyang 621900, China
  • 2Accelerator Laboratory, Tsinghua University, Beijing 100084, China
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    Figures & Tables(23)
    Categories of active phase control methods
    Principle of phase measurement by inclined interference[38]
    (a) Array structure and interference fringe pattern and (b) experiment results of interference-based coherent beam combining of 61 femtosecond fiber lasers[42]
    (a) System setup and (b) experiment results in interference-based coherent beam combining of 1 027 channels[44]
    (a) Experiment system and control effect of 107-channel SPGD coherent beam combining[60],(b) beam pattern of 19-channel 20 kW class SPGD coherent beam combining[17]
    Normalized intensity in open- and closed-loop of SPGD-based 61-channel coherent beam combining
    Multi-stage SPGD[73]
    Diagram of coherent beam combining system based on multi-dithering method
    Intensity comparison before and after control and closed-loop phase residual in 32-channel multi-dithering coherent beam combining[78]
    (a) Experiment setup and (b) phase-locking rising time of 19-channel coherent beam combining based on high-speed multi-dithering method. (c) Bandwidth evaluation system and (d) bandwidth test result of the phase control circuit
    2×4 coherent beam combining based on cascaded multi-dithering method[86]
    System setup of PIM phase control[87]
    PIM coherent beam combining of 37-channel fiber amplifiers[89]
    PIM-PR control method[88]
    DOE transmission function and intensity profile in simulation and experiment of 81-channel DOE coherent beam combining based on PIM[92]
    Establishment and training process of CNN[115]
    System setup and convergence curves of 100-channel CBC by quasi-reinforcement learning[100]
    81-channel coherent beam combining based on neural network algorithm[120]
    (a) Convergence curve of 7-channel coherent beam combining under different initial conditions and (b) convergence time versus element number by CNN and SPGD[122]
    Convergence curves of phase control by DDRM algorithm[124]
    Prediction errors and their statistic distribution for various true phases as CNN trained by (a) traditional and (b) periodical loss function[125]
    • Table 1. Representative results of large-scale coherent beam combining of fiber lasers

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      Table 1. Representative results of large-scale coherent beam combining of fiber lasers

      yearnumber of channelsinstitutionmethodsingle step timerising timeresidual
      201164[28]Thales Research & Technologyinterference50 msλ/10
      201132[78]University of New Mexicomulti-dithering2.45 μsλ/71
      201737[89]Université de LimogesPIM1 msλ/25
      202061[42]Thales Research & Technologyinterference1 msλ/55
      2020107[60]National University of Defense TechnologySPGD1 μsλ/22
      202181[92]Lawrence Berkeley National LabPIM33 ms
      202181[120]Lawrence Berkeley National Labmachine learning~10 ms~0.4 s
      202261China Academy of Engineering PhysicsSPGD~40 msλ/37
      2022100[100]Université de limogesmachine learning0.4 s~2.4 sλ/30
      2022397[43]National University of Defense Technologyinterference5 msλ/31
      20231027[44]National University of Defense Technologyinterference5 msλ/27
      202319China Academy of Engineering Physicsmulti-dithering2 μs6 μsλ/56
    • Table 2. Comparison of active phase control methods

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      Table 2. Comparison of active phase control methods

      methodsystem requirementexecution ratecontrol bandwidthoptical complexityalgorithm complexity
      interferencetiled apertureslowmediumhighmedium
      SPGDnonemediuminversely proportional to channelslowlow
      multi-ditheringnonefasthighlowmedium
      PIMDOE/tiled aperturefasthighmediummedium
      machine learningDOE/tiled apertureslowmediumlowhigh
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    Hongbing Zhou, Haoyu Zhang, Min Li, Xi Feng, Lianghua Xie, Yu Liu, Qiuhui Chu, Yuefang Yan, Rumao Tao, Honghuan Lin, Jianjun Wang, Lixin Yan, Feng Jing. Progress in active phase control for large-scale coherent laser beam combining[J]. High Power Laser and Particle Beams, 2024, 36(6): 061001

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    Paper Information

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    Received: Dec. 1, 2023

    Accepted: Mar. 11, 2024

    Published Online: Jun. 3, 2024

    The Author Email: Tao Rumao (supertaozhi@163.com)

    DOI:10.11884/HPLPB202436.230426

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