We study the predicted performance of two apodized pupil Lyot coronagraph designs in the presence of an occulter-plane field stop. We discuss techniques for capturing diffraction effects when the radius of the stop is larger than the field of view of an ordinary numerical diffraction model, including mask upsampling and analytical focal-plane envelope functions. We simulate a closed-loop coronagraphic wavefront control to assess the extent to which such diffraction effects can be compensated using deformable mirrors. We show that for the designs considered, field stop diffraction effects are significant at diameters considerably larger than the instrument field of view, suggesting the need to explicitly include a focal-plane stop in the design process.

中文翻译：

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变迹瞳孔Lyot日冕仪中的场停止衍射和采样效果。

我们研究了隐伏面场停止的存在下两个切趾瞳孔Lyot日冕仪设计的预测的性能。我们讨论了当光阑的半径大于普通数值衍射模型的视场时捕获衍射效应的技术，包括掩模上采样和分析焦平面包络函数。我们模拟一个闭环冠状波波前控制，以评估使用可变形反射镜可以补偿这种衍射效应的程度。我们表明，对于所考虑的设计，在直径远大于仪器视场的直径处，场阑衍射效应非常明显，这表明在设计过程中需要明确包括焦平面阑。