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Appl Opt. 2005 Nov 20;44(33):7070-3.

Symmetric nulling coronagraph based on a rotational shearing interferometer.

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Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102-1982, USA.


We describe a fully symmetric nulling coronagraph for single-aperture telescopes that is based on a rotational shearing interferometer (RSI) and that is intended for the imaging of faint companions to nearby bright stars. In the proposed layout, all asymmetries inherent in previous single-aperture RSI-based nulling coronagraphs have been eliminated, and the bright and dark outputs are both accessible. As a resulty deep, broadband, dual-polarization rejection of on-axis starlight should be possible with this system.

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