27 July 2016 Precise wavefront control for stellar coronagraphy: possibilities by a common-path extremely unbalanced interferometer
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Abstract
We propose to use an extremely unbalanced interferometer (EUI) as a wavefront correcting input to a stellar coronagraph for direct exoplanet imaging. Since a cumulative wavefront error causes incomplete suppression of stellar light, an EUI aims to correct precisely the wavefront incident to the coronagraph to a level better than λ/5000 in the visible wavelength range. EUI does not use an extremely precise deformable mirror, it increases the accuracy of a wavefront control effectively because of the coherent summation with an amplitude imbalance. It will enable obtaining the desirable 10-9 coronagraphic (raw) contrast for Earth-like exoplanet imaging.
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Ilia Dziuban, Inna Shashkova, Pavel Frolov, Yulia Bezymyannikova, Alexander Tavrov, "Precise wavefront control for stellar coronagraphy: possibilities by a common-path extremely unbalanced interferometer", Proc. SPIE 9909, Adaptive Optics Systems V, 99095B (27 July 2016); doi: 10.1117/12.2232506; https://doi.org/10.1117/12.2232506
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