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Speckle-metric-optimization-based adaptive optics for laser beam projection and coherent beam combining

机译：基于散斑优化的自适应光学器件，用于激光束投影和相干光束合成

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摘要

Maximization of a projected laser beam's power density at a remotely located extended object (speckle target) can be achieved by using an adaptive optics (AO) technique based on sensing and optimization of the target-return speckle field's statistical characteristics, referred to here as speckle metrics (SM). SM AO was demonstrated in a target-in-the-loop coherent beam combining experiment using a bistatic laser beam projection system composed of a coherent fiber-array transmitter and a power-in-the-bucket receiver. SM sensing utilized a 50 MHz rate dithering of the projected beam that provided a stair-mode approximation of the outgoing combined beam's wavefront tip and tilt with subaperture piston phases. Fiber-integrated phase shifters were used for both the dithering and SM optimization with stochastic parallel gradient descent control.
机译：可以通过基于目标返回散斑场的统计特性（此处称为散斑）的感测和优化的自适应光学（AO）技术，来实现位于远处扩展对象（散斑目标）处的投射激光束功率密度的最大化。指标（SM）。 SM AO在环目标相干光束组合实验中得到了证明，该实验使用了由相干光纤阵列发射器和桶中功率接收器组成的双基地激光束投影系统。 SM感测利用了投射光束的50 MHz速率抖动，该抖动提供了出射组合光束的波前尖端和子孔径活塞相位倾斜的阶梯模式近似。光纤集成移相器用于抖动和SM优化，并具有随机平行梯度下降控制。

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