A Coronagraph Based on Stepped-Transmission Filters

Details A Coronagraph Based on Stepped-Transmission Filters A Coronagraph Based on Stepped-Transmission Filters

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasp..119.1063r&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 119, Issue 859, pp. 1063-1068.

Astronomy and Astrophysics

Astronomy

6

Astronomical Instrumentation

Scientific paper

We propose a coronagraph for direct imaging of Earth-like planets orbiting nearby bright stars. The coronagraph is based on an apodization pupil composed of two stepped-transmission filters. We show that the coronagraph can achieve 10-10 high-contrast imaging at an angular distance larger than (2-3)λ/D theoretically. The employment of the stepped-transmission filters significantly simplifies the manufacturing of the transmission pupil, making it possible to be used for high-contrast imaging in practice.

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