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 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 (average about ) over the whole 40% bandwidth.
© 2016 Optical Society of America
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