Ge Yajun, Cao Qing, Hu Rongfei, Wang Kai, Tong Xiegang
Appl Opt. 2016 Feb 10;55(5):1006-11. doi: 10.1364/AO.55.001006.
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.
提出了一种级联六级相位掩膜消色差日冕仪。我们表明，在理想的无像差情况下，三级六级相位掩膜消色差日冕仪（SLPMC）中中心星光的平均抑制在40%带宽内可达到约10⁻⁸ 。我们还对三级SLPMC中每个相位掩膜的工作波长进行了优化分析。通过优化，在整个40%带宽内星光可稳定抑制到小于10⁻⁸ （平均约10⁻¹⁰ ）。
