BAND-LIMITED CORONAGRAPHS USING A HALFTONE DOT PROCESS: DESIGN GUIDELINES, MANUFACTURING, AND LABORATORY RESULTS
BAND-LIMITED CORONAGRAPHS USING A HALFTONE DOT PROCESS: DESIGN GUIDELINES, MANUFACTURING, AND LABORATORY RESULTS
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使用半色调点工艺的带限日冕图：设计指南、制造和实验室结果
DOI：
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发表时间：
2009
期刊：
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通讯作者：
M. Kasper
中科院分区：
文献类型：
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作者：
P. Martinez;C. Dorrer;M. Kasper
未来42米欧洲超大望远镜的系外行星成像相机和光谱仪将能够在红外线中直接拍摄年轻和年老的彗星质量行星的图像和光谱。为了达到所需的对比度，几种日冕照相的概念，以消除星光，正在研究中：传统的瞳孔变迹（CPA），变迹瞳孔Lyot日冕照相（APLC），双区日冕照相（DZC），四象限相位掩模（Four-quadrants Phase mask，Four-quadrants PM），多级Four-quadrants PM，环形槽相位掩模，高阶光学涡旋和带限日冕照相（BLC）。最近的实验表明，兴趣的半色调点的过程，即微点技术，以产生足够的传输配置文件的CPA，APLC和DZC概念的光瞳切趾。在这里，我们研究使用这种技术来生产带限焦平面掩模，并提出了设计准则。此外，我们提出了第一个近红外实验室的结果与BLC确认微粒的方法作为一个合适的技术，地面观测。
The Exo-Planet Imaging Camera and Spectrograph for the future 42 m European-Extremely Large Telescope will enable direct images and spectra for both young and old Jupiter-mass planets in the infrared. To achieve the required contrast, several coronagraphic concepts—to remove starlight—are under investigation: conventional pupil apodization (CPA), apodized-pupil Lyot coronagraph (APLC), dual-zone coronagraph (DZC), four-quadrants phase mask (FQPM), multi-stages FQPM, annular groove phase mask, high-order optical vortex, and band-limited coronagraph (BLC). Recent experiment demonstrated the interest of a halftone dot process—namely microdots technique—to generate the adequate transmission profile of pupil apodizers for CPA, APLC, and DZC concepts. Here, we examine the use of this technique to produce band-limited focal plane masks, and present guidelines for the design. Additionally, we present the first near-IR laboratory results with BLCs that confirm the microdots approach as a suitable technique for ground-based observations.