A Coronagraph Based on Stepped-Transmission Filters
Abstract
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.
- Publication:
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Publications of the Astronomical Society of the Pacific
- Pub Date:
- September 2007
- DOI:
- 10.1086/522015
- Bibcode:
- 2007PASP..119.1063R
- Keywords:
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- Astronomical Instrumentation