Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jetp..108..963t&link_type=abstract
Journal of Experimental and Theoretical Physics, Volume 108, Issue 6, pp.963-976
Physics
42.25.Hz, 42.25.Ja, 42.25.Kb, 07.60.-J, 95.55.Cs, 95.55.-N
Scientific paper
We propose a new scheme of an achromatic nulling interferometer-coronagraph to gain a higher contrast in the star-planet model. Two successive rotational shearing interferometers improve the interference contrast limited by insufficient spatial coherence of a physically extended source, a star. The theory and simulations have been confirmed by an experiment. The theoretical value of the coronagraphic contrast has been improved from 104 to 1010 for an angular size of the extended source of 10-2λ/ D, where λ is the wave-length and D is the telescope’s aperture diameter.
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