29 July 2016 Achromatic interfero-coronagraph with variable rotational shear in laboratory experiments
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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.
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Pavel Frolov, Pavel Frolov, Alexander Kiselev, Alexander Kiselev, Alexander Tavrov, 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); doi: 10.1117/12.2232523; https://doi.org/10.1117/12.2232523

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