Experimental demonstration of binary shaped pupil mask coronagraphs for telescopes with obscured pupils
Experimental demonstration of binary shaped pupil mask coronagraphs for telescopes with obscured pupils
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用于遮光瞳孔望远镜的二元形瞳孔面罩日冕仪的实验演示
DOI：
10.1093/pasj/psu161
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发表时间：
2015
影响因子：
2.3
通讯作者：
Tomoyasu
中科院分区：
文献类型：
--
作者：
Haze;Kanae; Enya;Keigo; Abe;Lyu; Takahashi;Aoi; Kotani;Takayuki; Yamamuro;Tomoyasu
我们提出了三个独立的二进制形状的瞳孔掩模日冕仪，这是适用于部分遮蔽的瞳孔望远镜的制造和实验演示。在5 μm厚的镍中形成三个互补的掩模（标记为掩模A、掩模B和掩模C）。Mask-A的设计基于一维条形码掩模。Mask-B的设计原理与Mask-A相似，但内部工作角较小，对比度较低。Mask-C基于同心环掩模，并提供最宽的暗区和对称点扩散函数。掩模-A和掩模-C都被设计成产生灵活定制的暗区（即，非均匀对比度）。使用包括中心波长为650 nm的宽带超发光发光二极管的光源来评价对比度，并且在大真空室中进行测量。在这项工作中没有应用主动波前控制。实验得到的日冕图像与设计基本一致。在3.3-8 λ/D和8-12 λ/D范围内，Mask-A的对比度分别为λ 10−4-10− 7和λ 10−7，其中λ为波长，D为瞳孔直径。Mask-B的对比度为10− 4，而Mask-C在扩展视场（5-25 λ/D）上的对比度为10−5-10−6。研究了倾斜掩模的影响，发现在10− 7的对比度水平上是无关紧要的。因此，可以倾斜掩模以避免重影。这些高对比度的独立式掩模有可能使用地面和空间通用望远镜在宽波长范围内进行日冕成像，这些望远镜的瞳孔结构不是专门为日冕成像设计的。
We present the fabrication and experimental demonstration of three free-standing binary shaped pupil mask coronagraphs, which are applicable for telescopes with partially obscured pupils. Three masks, designed to be complementary (labeled Mask-A, Mask-B, and Mask-C), were formed in 5 μm thick nickel. The design of Mask-A is based on a one-dimensional barcode mask. The design principle of Mask-B is similar, but has a smaller inner working angle and a lower contrast than Mask-A. Mask-C is based on a concentric ring mask and provides the widest dark region and a symmetric point spread function. Mask-A and Mask-C were both designed to produce a flexibly tailored dark region (i.e., non-uniform contrast). The contrast was evaluated using a light source comprising a broadband super-luminescent light-emitting diode with a center wavelength of 650 nm, and the measurements were carried out in a large vacuum chamber. Active wavefront control was not applied in this work. The coronagraphic images obtained by experiment were mostly consistent with the designs. The contrast of Mask-A within the ranges 3.3–8 λ/Dand 8–12 λ/Dwas ∼ 10−4–10−7and ∼ 10−7, respectively, where λ is the wavelength andDis the pupil diameter. The contrast of Mask-B was ∼ 10−4and that of Mask-C over an extended field of view (5–25 λ/D) was ∼ 10−5–10−6. The effect of tilting the masks was investigated, and found to be irrelevant at the ∼ 10−7contrast level. Therefore the masks can be tilted to avoid ghosting. These high-contrast free-standing masks have the potential to enable coronagraphic imaging over a wide wavelength range using both ground-based and space-borne general-purpose telescopes with pupil structures not specifically designed for coronagraphy.
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