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Journal of Astronomical Telescopes, Instruments, and Systems

Extremely unbalanced interferometer for precise wavefront control in stellar coronagraphy
Author(s): Inna Shashkova; Boris Shkursky; Pavel Frolov; Yulia Bezymyannikova; Alexander Kiselev; Jun Nishikawa; Alexander Tavrov
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Paper Abstract

We propose to use an extremely unbalanced interferometer (EUI) as a wavefront correcting input to a stellar coronagraph for direct exoplanet observation. Since wavefront error causes incomplete suppression of stellar light, an EUI aims to precisely correct the wavefront incident on the coronagraph to a level better than λ/5000 in the visible wavelength range. Compared to the previous unbalanced interferometer, which incorporated a nulling function, the proposed EUI does not introduce the nulling function. EUI does not use a precise deformable mirror. It increases the accuracy of a wavefront control effectively because of the coherent summation with an amplitude imbalance. It enables obtaining the desirable 10−9 coronagraphic contrast for Earth-like exoplanet imaging.

Paper Details

Date Published: 24 December 2015
PDF: 6 pages
J. Ast. Inst. Sys. 2(1) 011011 doi: 10.1117/1.JATIS.2.1.011011
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 2, Issue 1
Show Author Affiliations
Inna Shashkova, Space Research Institute (Russian Federation)
Boris Shkursky, Space Research Institute (Russian Federation)
Pavel Frolov, Space Research Institute (Russian Federation)
Yulia Bezymyannikova, Moscow Institute of Physics and Technology (Russian Federation)
Space Research Institute (Russian Federation)
Alexander Kiselev, Space Research Institute (Russian Federation)
Moscow Institute of Physics and Technology (Russian Federation)
Jun Nishikawa, National Astronomical Observatory of Japan (Japan)
Alexander Tavrov, Space Research Institute (Russian Federation)
Moscow Institute of Physics and Technology (Russian Federation)


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