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Proceedings Paper

A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction
Author(s): Jun Nishikawa; Kaito Yokochi; Naoshi Murakami; Lyu Abe; Takayuki Kotani; Motohide Tamura; Takashi Kurokawa; Alexander V. Tavrov; Mitsuo Takeda; Hiroshi Murakami
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Paper Abstract

We have proposed a four-stage coronagraph system with an unbalanced nulling interferometer (UNI). It consists of a first adaptive optics (AO), the UNI, a second AO, and a coronagraph. An important feature is a magnification of the wavefront aberrations in the UNI stage, which enables us to compensate for the wavefront aberrations beyond the AO systems capabilities. In our experiments, we have observed the aberration magnification of about 6 times and compensated to about lambda/100 rms corresponding to lambda/600 rms virtually, and its performance is becoming stable. We have put a 3-dimensional Sagnac interferometric nulling coronagraph at the final stage of the system and tried to see the speckle reduction with the UNI-PAC system.

Paper Details

Date Published: 10 August 2010
PDF: 6 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77314O (10 August 2010); doi: 10.1117/12.856945
Show Author Affiliations
Jun Nishikawa, National Astronomical Observatory of Japan (Japan)
Kaito Yokochi, Tokyo Univ. of Agriculture and Technology (Japan)
National Astronomical Observatory of Japan (Japan)
Naoshi Murakami, Hokkaido Univ. (Japan)
Lyu Abe, Univ. de Nice Sophia Antipolis (France)
Takayuki Kotani, Japan Aerospace Exploration Agency (Japan)
Motohide Tamura, National Astronomical Observatory of Japan (Japan)
Takashi Kurokawa, Tokyo Univ. of Agriculture and Technology (Japan)
Alexander V. Tavrov, Space Research Institute (Russian Federation)
Mitsuo Takeda, The Univ. of Electro-Communications (Japan)
Hiroshi Murakami, Japan Aerospace Exploration Agency (Japan)


Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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