The achromatic phase knife coronagraph

Details The achromatic phase knife coronagraph The achromatic phase knife coronagraph

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374.1161a&link_type=abstract

Astronomy and Astrophysics, v.374, p.1161-1168 (2001)

Astronomy and Astrophysics

Astrophysics

25

Techniques: Interferometric, Stars: Binaries: Close, Stars: Planetary Systems

Scientific paper

We present the concept of a nulling coronagraph which theoretically attains the brightness ratio of 108 suitable to directly detect exo-Earths in the vicinity of their parent stars. The concept is derived from the classical Foucault's optics test and Zernike's self-destructive phase contrast principle. We propose an achromatic set-up which should dramatically improve its wide band efficiency. The whole system is simulated against a numerical model which validates a formal analytical approach. The coronagraph is then compared to other concepts and its advantages and shortcomings are outlined, suggesting future laboratory developments and tests on the sky.

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