ACHROMATIC EIGHT-OCTANT PHASE-MASK CORONAGRAPH USING PHOTONIC CRYSTAL
ACHROMATIC EIGHT-OCTANT PHASE-MASK CORONAGRAPH USING PHOTONIC CRYSTAL
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DOI：
10.1088/0004-637x/714/1/772
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
N. Murakami;J. Nishikawa;K. Yokochi;M. Tamura;N. Baba;L. Abe
中科院分区：
文献类型：
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作者：
N. Murakami;J. Nishikawa;K. Yokochi;M. Tamura;N. Baba;L. Abe
我们设计并制造了一种光子晶体掩模，可用于直接探测系外行星的消色差八八分相掩模（EOPM）日冕仪。利用两个激光光源作为模拟恒星（波长分别为532 nm和633 nm），进行了EOPM日冕仪的室内实验。结果，我们获得了两个波长的模拟星光的高消光。在3λ/D和13λ/D的角距离处，光晕强度分别达到10−6和10−7。我们还讨论了几个问题，如相位像差对日冕性能的影响，所提出的EOPM的透射率，以及一种新的双通道日冕配置，以提高系统吞吐量。
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 13λ/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.