24 December 2015 Extremely unbalanced interferometer for precise wavefront control in stellar coronagraphy
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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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Inna Shashkova, Inna Shashkova, Boris Shkursky, Boris Shkursky, Pavel Frolov, Pavel Frolov, Yulia Bezymyannikova, Yulia Bezymyannikova, Alexander Kiselev, Alexander Kiselev, Jun Nishikawa, Jun Nishikawa, Alexander Tavrov, Alexander Tavrov, } "Extremely unbalanced interferometer for precise wavefront control in stellar coronagraphy," Journal of Astronomical Telescopes, Instruments, and Systems 2(1), 011011 (24 December 2015). https://doi.org/10.1117/1.JATIS.2.1.011011 . Submission:

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