Precise wavefront control for stellar coronagraphy: possibilities by a common-path extremely unbalanced interferometer

Ilia Dziuban; Inna Shashkova; Pavel Frolov; Yulia Bezymyannikova; Alexander Tavrov

doi:10.1117/12.2232506

27 July 2016 Precise wavefront control for stellar coronagraphy: possibilities by a common-path extremely unbalanced interferometer

Ilia Dziuban, Inna Shashkova, Pavel Frolov, Yulia Bezymyannikova, Alexander Tavrov

Author Affiliations +

Proceedings Volume 9909, Adaptive Optics Systems V; 99095B (2016) https://doi.org/10.1117/12.2232506
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

Ilia Dziuban, Inna Shashkova, Pavel Frolov, Yulia Bezymyannikova, and 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); https://doi.org/10.1117/12.2232506

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