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Comparative efficiency analysis of fiber-array and conventional beam director systems in volume turbulence

机译：光纤阵列和传统光束导向器系统在体积湍流中的比较效率分析

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The performance of two prominent laser beam projection system types is analyzed through wave-optics numerical simulations for various atmospheric turbulence conditions, propagation distances, and adaptive optics (AO) mitigation techniques. Comparisons are made between different configurations of both a conventional beam director (BD) using a monolithic-optics-based Cassegrain telescope and a fiber-array BD that uses an array of densely packed fiber collimators. The BD systems considered have equal input power and aperture diameters. The projected laser beam power inside the Airy size disk at the target plane is used as the performance metric. For the fiber-array system, both incoherent and coherent beam combining regimes are considered. We also present preliminary results of side-by-side atmospheric beam projection experiments over a 7-km propagation path using both the AO-enhanced beam projection system with a Cassegrain telescope and the coherent fiber-array BD composed of 21 densely packed fiber collimators. Both wave-optics numerical simulation and experimental results demonstrate that, for similar system architectures and turbulence conditions, coherent fiber-array systems are more efficient in mitigation of atmospheric turbulence effects and generation of a hit spot of the smallest possible size on a remotely located target. (C) 2016 Optical Society of America
机译：通过各种大气湍流条件，传播距离和自适应光学（AO）缓解技术的波光学数值模拟，分析了两种主要的激光束投影系统类型的性能。比较了使用基于单片光学的卡塞格伦望远镜的常规光束导向器（BD）和使用密集排列的光纤准直器阵列的光纤阵列BD的不同配置。所考虑的BD系统具有相等的输入功率和孔径。在目标平面的艾里尺码盘内的投影激光束功率用作性能指标。对于光纤阵列系统，要考虑非相干和相干光束合并方案。我们还介绍了在7公里传播路径上同时进行的并排大气束投影实验的初步结果，这些实验均使用带Cassegrain望远镜的AO增强束投影系统和由21个密集堆积的光纤准直仪组成的相干光纤阵列BD进行。波光学数值模拟和实验结果均表明，对于类似的系统架构和湍流条件，相干光纤阵列系统在缓解大气湍流效应以及在远程目标上产生最小尺寸的撞击点方面更为有效。 。 （C）2016美国眼镜学会

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