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.

© 2016 Optical Society of America

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