Multiple-stage apodized pupil Lyot coronagraph for high-contrast imaging
Multiple-stage apodized pupil Lyot coronagraph for high-contrast imaging
复制标题
用于高对比度成像的多级变迹瞳孔 Lyot 冠状仪
DOI：
10.1117/12.552049
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
R. Soummer
中科院分区：
文献类型：
--
作者：
C. Aime;R. Soummer
我们描述了由Aime， summer和Ferrari （A&A 2002, 389,334344）首次提出的用于探测系外行星的多级Lyot日冕仪。这个日冕仪使用了几个阶段。第一阶段是延长Apodized Lyot日冕仪（PALC）。它在孔径上产生的残余波前与入口长球面apoapozed波前成正比。这允许使用第二阶段的日冕，只需要一个Lyot面具，相同的第一个，没有任何进一步的孔径apoization。得到的消光因子是初始PALC的平方。使用几个阶段可以获得相当大的小尺寸冠状口罩的拒绝系数和良好的总体吞吐量。
We describe the multiple-stage Lyot coronagraph first proposed by Aime, Soummer and Ferrari (A&A 2002, 389,334344) for the detection of exoplanets. This coronagraph uses several stages. The first stage is a Prolate Apodized Lyot Coronagraph (PALC). It produces a residual wavefront on the aperture that is proportional to the entrance prolate spheroidal apodized wavefront. This permits the use of a second stage of coronagraphy, needing only a Lyot mask, identical to the first one, without any further aperture apodization. The resulting extinction factor is the square of the initial PALC. Using several stages permits to obtain considerable rejection factors for small-size coronagraphic masks and good overall throughput.