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Bandwidth and stability of the stochastic parallel gradient descent algorithm for phase control in coherent beam combination

机译:相干波束组合中相位控制的随机平行梯度下降算法的带宽与稳定性

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摘要

The bandwidth and stability limits of the stochastic parallel gradient descent (SPGD) algorithm used for coherent beam combination is investigated by deriving an analytical model for the phase control loop. The analytical model is compared to experiments and numerical simulations using a laboratory tiled coherent beam combination setup. The setup consisted of four sub-beams from fiber-optic collimators and used a backreflected signal as feedback. A rotating phase plate was used to induce phase disturbances into the system. The analytical model compared favorably to numerical simulations and experiments as well as to other studies found in the literature. The results can be used to provide an estimate of the achievable phase control bandwidth of coherent beam combination systems using SPGD as a control algorithm. (C) 2021 Optical Society of America
机译:通过推导相位控制环路的解析模型,研究了用于相干光束合成的随机并行梯度下降(SPGD)算法的带宽和稳定性极限。利用实验室平铺相干光束组合装置,将解析模型与实验和数值模拟进行了比较。该装置由来自光纤准直器的四个子光束组成,并使用反向反射信号作为反馈。使用旋转相位板将相位扰动引入系统。与数值模拟和实验以及文献中发现的其他研究相比,该分析模型更具优势。所得结果可用于估计使用SPGD作为控制算法的相干光束组合系统可实现的相位控制带宽。(2021)美国光学学会

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  • 来源
    《Applied optics》 |2021年第15期|共9页
  • 作者单位

    FOI Swedish Def Res Agcy Box 1165 S-58111 Linkoping Sweden;

    FOI Swedish Def Res Agcy Box 1165 S-58111 Linkoping Sweden;

    FOI Swedish Def Res Agcy Box 1165 S-58111 Linkoping Sweden;

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  • 正文语种 eng
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