Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...451..363a&link_type=abstract
Astronomy and Astrophysics, Volume 451, Issue 1, May III 2006, pp.363-373
Astronomy and Astrophysics
Astrophysics
5
Instrumentation: High Angular Resolution, Telescopes, Techniques: Miscellaneous
Scientific paper
This paper describes a method for removing the effect of a centrally obscured aperture with additional spider arms in arbitrary geometrical configurations. The proposed method is based on a two-stage process where the light beam is first shaped to remove the central obscuration and spider arms, in order to feed a second, highly efficient coronagraph. The beam-shaping stage is a combination of a diffraction mask in the first focal plane and a complex amplitude filter located in the conjugate pupil. This paper specifically describes the case of using Lyot occulting masks and circular phase-shifting masks as diffracting components. The basic principle of the method is given along with an analytical description and numerical simulations. Substantial improvement in the performance of high-contrast coronagraphs can be obtained with this method, even if the beam-shaping filter is not perfectly manufactured.
Abe Lyu
Murakami Noriko
Nishikawa Jared
Tamura Masafumi
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