Vorontsov M A, Carhart G W
Opt Lett. 2002 Dec 15;27(24):2155-7. doi: 10.1364/ol.27.002155.
We introduce beam-quality metrics for adaptive wave-front control that permit estimation of the degree of laser beam energy concentration on a remotely located extended object based upon the backscattered wave intensity distribution at the receiver. A 37-control-channel adaptive optics system with phase correction of the output wave capable of operating in the presence of speckle-field-induced strong intensity modulation is presented. System operation is based on optimization of the speckle-field-based metric by the stochastic parallel gradient descent technique. Results demonstrate that adaptive wave-front correction using speckle-field-based beam-quality metrics can significantly improve laser beam concentration on extended objects.
我们引入了用于自适应波前控制的光束质量指标，该指标允许根据接收器处的反向散射波强度分布来估计位于远程的扩展物体上的激光束能量集中程度。本文提出了一种具有37个控制通道的自适应光学系统，该系统能够在存在散斑场引起的强强度调制的情况下对输出波进行相位校正。系统操作基于通过随机并行梯度下降技术对基于散斑场的指标进行优化。结果表明，使用基于散斑场的光束质量指标进行自适应波前校正可以显著提高扩展物体上的激光束集中度。
