Special Section on WFIRST-AFTA Coronagraphs

Extremely unbalanced interferometer for precise wavefront control in stellar coronagraphy

[+] Author Affiliations
Inna Shashkova, Boris Shkursky, Pavel Frolov

IKI-RAS Space Research Institute of RAS, Profsoyuznaya ul. 84/32, Moscow 117997, Russia

Yulia Bezymyannikova

Moscow Institute of Physics and Technology, Dolgoprudny, Institutskii per. 9, Moscow Oblast 141700, Russia

Alexander Kiselev, Alexander Tavrov

IKI-RAS Space Research Institute of RAS, Profsoyuznaya ul. 84/32, Moscow 117997, Russia

Moscow Institute of Physics and Technology, Dolgoprudny, Institutskii per. 9, Moscow Oblast 141700, Russia

Jun Nishikwa

National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

J. Astron. Telesc. Instrum. Syst. 2(1), 011011 (Dec 24, 2015). doi:10.1117/1.JATIS.2.1.011011
History: Received April 1, 2015; Accepted November 23, 2015
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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 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 109 coronagraphic contrast for Earth-like exoplanet imaging.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Inna Shashkova ; Boris Shkursky ; Pavel Frolov ; Yulia Bezymyannikova ; Alexander Kiselev, et al.
"Extremely unbalanced interferometer for precise wavefront control in stellar coronagraphy", J. Astron. Telesc. Instrum. Syst. 2(1), 011011 (Dec 24, 2015). ; http://dx.doi.org/10.1117/1.JATIS.2.1.011011


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