An Eight-Octant Phase-Mask Coronagraph

Details An Eight-Octant Phase-Mask Coronagraph An Eight-Octant Phase-Mask Coronagraph

2008-09-09

arxiv.org/abs/0809.1510v1

Astronomy and Astrophysics

Astrophysics

17 pages, 6 figures, Accepted for publication in PASP

Scientific paper

10.1086/592285

We present numerical simulations and laboratory experiments on an eight-octant phase-mask (EOPM) coronagraph. The numerical simulations suggest that an achievable contrast for the EOPM coronagraph can be greatly improved as compared to that of a four-quadrant phase-mask (FQPM) coronagraph for a partially resolved star. On-sky transmission maps reveal that the EOPM coronagraph has relatively high optical throughput, a small inner working angle and large discovery space. We have manufactured an eight-segment phase mask utilizing a nematic liquid-crystal device, which can be easily switched between the FQPM and the EOPM modes. The laboratory experiments demonstrate that the EOPM coronagraph has a better tolerance of the tip-tilt error than the FQPM one. We also discuss feasibility of a fully achromatic and high-throughput EOPM coronagraph utilizing a polarization interferometric technique.

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