Stellar coronagraph using the principle of achromatic null-interferometer

Details Stellar coronagraph using the principle of achromatic null-interferometer Stellar coronagraph using the principle of achromatic null-interferometer

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011cosre..49...99t&link_type=abstract

Cosmic Research, Volume 49, Issue 2, pp.99-109

Physics

Scientific paper

In order to observe exoplanets we propose a space-based achromatic stellar coronagraph combined with a 0.8-1.5 m telescope. We develop an achromatic common path interferometer for observing an exoplanet (a faint off-axis source) on the background of a hoste star (bright axial source). An image of the star and its copy acquire an achromatic phase shift by 180° and interfere in antiphase. The achromatic phase shift is caused by geometric phase in the scheme of a three-dimensional interferometer. The interference process divides spatially the dark and light fields of the star image redirecting them to the opposite sides of a beam splitter. The interference process does not weaken the image of a planet, with equal intensities it is redirected to both sides of a beam splitter. The suggested scheme of common path interferometer ensures mechanical stability. The background signal is experimentally demonstrated to be reduced by six orders of magnitude.

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