ACHROMATIC EIGHT-OCTANT PHASE-MASK CORONAGRAPH USING PHOTONIC CRYSTAL

被引：43
作者：
Murakami, Naoshi [1 ]
Nishikawa, Jun [2 ]
Yokochi, Kaito [2 ,3 ]
Tamura, Motohide [2 ]
Baba, Naoshi [1 ]
Abe, Lyu [4 ]
机构：
[1] Hokkaido Univ, Div Appl Phys, Sapporo, Hokkaido 0608628, Japan
[2] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
[3] Tokyo Univ Agr & Technol, Koganei, Tokyo 1848588, Japan
[4] Univ Nice Sophia Antipolis, Lab Hippolyte Fizeau, UMR 6525, F-06108 Nice, France
来源：
ASTROPHYSICAL JOURNAL | 2010年 / 714卷 / 01期
基金：
日本学术振兴会;
关键词：
instrumentation: miscellaneous; methods: laboratory; planetary systems; techniques: interferometric; techniques: miscellaneous; techniques: polarimetric; STELLAR CORONAGRAPH; EXTRASOLAR PLANET; HR; 8799; LIGHT; SPECTROSCOPY; SPECTRUM; SPACE; IMAGE; EARTH; STAR;
D O I：
10.1088/0004-637X/714/1/772
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We designed and manufactured a photonic-crystal mask which can be used for an achromatic eight-octant phase-mask (EOPM) coronagraph for direct detection of extrasolar planets. Laboratory experiments of the EOPM coronagraph were carried out using two laser light sources as a simulated star (wavelengths of 532 and 633 nm). As a result, we attained high extinction of the simulated starlight in both the wavelengths. Halo intensity levels of about 10(-6) and 10(-7) were achieved at an angular distance of 3 and 13 lambda/D, respectively. We also discuss several issues, such as an effect of phase aberration on the coronagraphic performance, a transmittance of the proposed EOPM, and a novel two-channel coronagraphic configuration to improve system throughput.
引用
收藏
页码：772 / 777
页数：6
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