We have demonstrated an experimental setup for the coherent phasing of a seven-channel fibre laser system (λ = 1064 nm) in a scheme comprising a master oscillator and a set of parallel amplifiers with lithium niobate-based fibre-optic phase modulators. Using a stochastic parallel gradient algorithm, an instrumental phase modulator control unit ensures a bandwidth of the system up to 450 kHz. The effectiveness of phasing of light transmitted through a turbulent medium with a characteristic time scale τ turb has been studied experimentally as a function of phasing time τ ph . The results demonstrate that the average Strehl ratio begins to rise at τ turb /τ ph ≥ 2 and that the effectiveness of compensation for dynamic phase distortions in the beam propagation path rises sharply at τ turb /τ ph ##IMG## [https://ej.iop.org/icons/Entities/asymp.gif] {asymp} 2...

中文翻译：

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使用随机平行梯度算法在带宽为450 kHz时对具有动态湍流相位畸变的七通道光纤激光辐射进行定相

我们已经演示了一种七通道光纤激光系统（λ= 1064 nm）的相干相位的实验设置，该方案包括一个主振荡器和一组基于铌酸锂的光纤相位调制器的并行放大器。仪器相位调制器控制单元使用随机并行梯度算法，可确保系统带宽高达450 kHz。已经通过实验研究了通过具有特征时间标度τturb的湍流介质传输的光的相位效率与相位时间τph的关系。结果表明，平均Strehl比在τturb /τph≥2时开始上升，并且光束传播路径中动态相位畸变的补偿效果在τturb /τph时急剧上升。 //ej.iop.org/icons/Entities/asymp。