The sensitivity of shaped pupil coronagraphs to optical aberrations
The sensitivity of shaped pupil coronagraphs to optical aberrations
复制标题
成形光瞳冠状仪对光学像差的敏感性
DOI：
10.1117/12.552328
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
N. Kasdin
中科院分区：
文献类型：
--
作者：
J. Green;S. Shaklan;R. Vanderbei;N. Kasdin
与焦平面日冕仪不同，焦平面日冕仪使用掩蔽点和Lyot光阑来消除衍射，瞳孔平面日冕仪通过塑造瞳孔来将衍射的恒星光重定向到紧密的核心。与焦平面日冕仪一样，望远镜中的光学像差必须得到足够的校正，以实现高对比度成像。而在赋形光瞳日冕仪中，由失调和光学图形漂移引起的低阶像差对内工作角处的对比度影响要小得多。这些较弱的灵敏度大大放松了严格的低阶波前稳定性所需的高对比度成像的一些吞吐量的成本。在本文中，我们提出了模拟性能的同心环形瞳孔的概念，比较它们的焦平面日冕仪，优化相同的内部工作角。
Unlike focal-plane coronagraphs that use occulting spots and Lyot stops to eliminate diffraction, pupil-plane coronagraphs operate by shaping the pupil to redirect the diffracted stellar light into a tight core. As with focal-plane coronagraphs, the optical aberrations in the telescope must be sufficiently corrected to enable high contrast imaging. However, in shaped-pupil coronagraphs, the low-order aberrations resulting from misalignment and optical figure drift have a much smaller influence upon the contrast at the inner working angle. These weaker sensitivities greatly relax the strict low-order wavefront stability required for high-contrast imaging at the cost of some throughput. In this paper, we present the simulated performance of the concentric ring shaped pupil concepts comparing them to focal-plane coronagraphs that are optimized for the same inner working angles.