Pupil Mapping in Two Dimensions for High-Contrast Imaging
Pupil Mapping in Two Dimensions for High-Contrast Imaging
复制标题
用于高对比度成像的二维瞳孔映射
DOI：
10.1086/429909
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
W. Traub
中科院分区：
文献类型：
--
作者：
R. Vanderbei;W. Traub
光瞳映射是一种技术，可以将均匀照明的输入光瞳（例如来自星光的光瞳）映射到非均匀照明的出射光瞳，使得从该光瞳形成的图像将具有抑制的旁瓣，比经典艾里环强度弱多个数量级。因此，瞳孔映射是对附近恒星周围的太阳系外行星进行日冕成像的候选技术。光瞳映射技术是无损的，并且保留了收集望远镜的全角分辨率，因此它可能提供任何拟议的用于探测太阳系外行星的单望远镜系统中最高的信噪比。一颗比其母星暗 10-10 倍且近至约 2λ/D 的行星应该可以被探测到。我们推导了双镜和双镜头系统的光瞳映射的二维方程。我们给出了这两种情况的例子。我们对双镜系统中的像差进行了分析估计，并表明像差基本上是通过添加一组反向镜子来校正的。
Pupil mapping is a technique whereby a uniformly illuminated input pupil, such as from starlight, can be mapped into a nonuniformly illuminated exit pupil, such that the image formed from this pupil will have suppressed sidelobes, many orders of magnitude weaker than classical Airy ring intensities. Pupil mapping is therefore a candidate technique for coronagraphic imaging of extrasolar planets around nearby stars. The pupil mapping technique is lossless and preserves the full angular resolution of the collecting telescope, so it could possibly give the highest signal-to-noise ratio of any proposed single-telescope system for detecting extrasolar planets. A planet fainter than 10-10 times its parent star and as close as about 2λ/D should be detectable. We derive the two-dimensional equations of pupil mapping for both two-mirror and two-lens systems. We give examples for both cases. We derive analytical estimates of aberration in a two-mirror system and show that the aberrations are essentially corrected with an added reversed set of mirrors.