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Real-time focal-plane wavefront sensing for compact imaging phased-array telescopes: numerical and experimental demonstration

机译：紧凑型成像相控阵望远镜的实时焦平面波前传感：数值和实验演示

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摘要

Phase retrieval and phase diversity are wavefront sensing techniques fed by focal-plane data. In phase retrieval, the incoming wavefront is estimated from a single (near-) focal image of an unresolved source. In phase diversity, from at least two images of the same (complex) object recorded in presence of a known optical aberration (eg. defocus), both the unknown incoming wavefront and the observed object can be derived. These two techniques have many advantages: the hardware is limited to (or can be merged in) the usual imaging sensor, the number of estimated modes can be continuously tuned and both are among the very few methods enabling the measurement of differential pistons/tip/tilts on segmented or divided apertures. The counterpart is that complexity is reported to digital processing, which is either iterative and long, or fast but limited to a first-order phase expansion. Based on an innovative physical approach and mathematical inversion, new simple, analytical and exact algorithms have been recently derived for phase retrieval and diversity. Conjugated with recent detector and processor advances, these algorithms can be implemented in adaptive/active optics loops, or even provide a purely-digital on-the-fly alternative. In this paper, for the first time, we present experimental validation of these algorithms with the cophasing of a segmented mirror.
机译：相位检索和相位分集是焦平面数据馈送的波前传感技术。在相位检索中，从未解析源的单个（近）焦点图像估计入射波前。在相位分集中，从存在已知光学像差（例如散焦）的情况下记录的同一（复杂）物体的至少两幅图像中，既可以得出未知的入射波阵面，也可以得出观察到的物体。这两种技术具有许多优点：硬件仅限于（或可以合并到）常规成像传感器中，可以连续调整估计模式的数量，并且这两种都是能够测量差动活塞/尖端/的极少数方法之一在分段或分割的光圈上倾斜。与此相对的是，将复杂性报告给数字处理，这既是迭代的又是漫长的，或者是快速的，但仅限于一阶相位扩展。基于一种创新的物理方法和数学反演，最近已经获得了用于相位检索和分集的新的简单，分析和精确算法。与检测器和处理器的最新发展相结合，这些算法可以在自适应/有源光学环路中实现，甚至可以提供纯数字化的实时选择。在本文中，我们首次提出了将这些算法与分段镜同相的实验验证。

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  • 来源
  • 会议地点 Baltimore MD(US)
  • 作者

    B. Denolle; F. Cassaing; J. Montri; J. Lisowski; J.P. Amans;

  • 作者单位

    Onera - The French Aerospace Lab F-92322 Chatillon, France,Groupement d'Interet Scientifique PHASE between Onera, Observatoire de Paris, CNRS and Universite Paris Diderot;

    Onera - The French Aerospace Lab F-92322 Chatillon, France,Groupement d'Interet Scientifique PHASE between Onera, Observatoire de Paris, CNRS and Universite Paris Diderot;

    Onera - The French Aerospace Lab F-92322 Chatillon, France,Groupement d'Interet Scientifique PHASE between Onera, Observatoire de Paris, CNRS and Universite Paris Diderot;

    Onera - The French Aerospace Lab F-92322 Chatillon, France,Groupement d'Interet Scientifique PHASE between Onera, Observatoire de Paris, CNRS and Universite Paris Diderot;

    Observatoire de Meudon/GEPI F-92195 Meudon, France,Groupement d'Interet Scientifique PHASE between Onera, Observatoire de Paris, CNRS and Universite Paris Diderot;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Phase retrieval; phase diversity; optical interferometry; multiple-aperture imaging, wavefront sens-ing; inverse problem;

    机译：相位检索；相位分集；光学干涉仪多孔径成像，波前感测；反问题;

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