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Published on: January 28, 2019
Cascade six-level phase-mask achromatic coronagraph
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.
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