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Direct imaging of earth-like extrasolar planets in the habitable zone and the search for possible biological signatures are
among the key scientific objectives in the modern astronomy. Stellar coronagraph such as achromatic interfero
coronagraph (AIC) with a small inner working angle has limited possibilities to detect and characterize planets around
nearby stars due to the star leakage effect caused by incomplete suppression of the star of finite angular size. We report
on an improved instrument for direct imaging of exoplanets and the study of stellar environment – common-path
achromatic interfero-coronagraph with variable rotational shear (common-path achromatic rotation-shearing
coronagraph, CP-ARC) – a common path implementation of rotation shearing interferometer. We detail CP-ARC
approach and discuss its optical configuration, laboratory prototype and experimental results.
Pavel Frolov,Alexander Kiselev, andAlexander Tavrov
"Achromatic interfero-coronagraph with variable rotational shear in laboratory experiments", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990454 (29 July 2016); https://doi.org/10.1117/12.2232523
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Pavel Frolov, Alexander Kiselev, Alexander Tavrov, "Achromatic interfero-coronagraph with variable rotational shear in laboratory experiments," Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990454 (29 July 2016); https://doi.org/10.1117/12.2232523