Abstract: A cascade six-level phase-mask achromatic coronagraph is proposed. We show that, for the ideal aberration-free case, the average suppression of the central starlight in a three-stage six-level phase-mask achromatic coronagraph (SLPMC) can reach about 10−8 over a 40% bandwidth. We also do the optimization analysis of the working wavelength of each phase mask in the three-stage SLPMC. With optimization, the starlight can be stably suppressed to less than 10−8 (average about 10−10) over the whole 40% bandwidth.
Publication Year: 2016
Publication Date: 2016-02-05
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 2
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