Abstract. Pupil densification is a technique to improve contrast in a direct imaging interferometer. By enlarging the size of each aperture in a sparse array, the fraction of energy contained in the central point spread function peak can be increased. However, the effective field of view is reduced as the contrast improves. Our work investigates the optimal strategy for pupil densification in the context of extended source imaging. Analytical expressions are derived to optimize the signal-to-noise ratio at the edge of the field of view for a variety of hypertelescope configurations. Free-space beam transport and fiber-optic beam transport are both considered. The relative advantages and disadvantages between the considered hypertelescope configurations are discussed.

中文翻译：

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扩展源成像背景下的瞳孔致密化

摘要。瞳孔致密化是一种提高直接成像干涉仪对比度的技术。通过扩大稀疏阵列中每个孔径的大小，可以增加包含在中心点扩展函数峰值中的能量分数。但是，随着对比度的提高，有效视野会减少。我们的工作研究了在扩展源成像背景下瞳孔密集化的最佳策略。导出分析表达式以优化各种超望远镜配置的视场边缘的信噪比。自由空间光束传输和光纤光束传输都被考虑。讨论了所考虑的超望远镜配置之间的相对优势和劣势。