A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction

Jun Nishikawa; Kaito Yokochi; Naoshi Murakami; Lyu Abe; Takayuki Kotani; Motohide Tamura; Takashi Kurokawa; Alexander V. Tavrov; Mitsuo Takeda; Hiroshi Murakami

doi:10.1117/12.856945

10 August 2010 A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction

Jun Nishikawa, Kaito Yokochi, Naoshi Murakami, Lyu Abe, Takayuki Kotani, Motohide Tamura, Takashi Kurokawa, Alexander V. Tavrov, Mitsuo Takeda, Hiroshi Murakami

Author Affiliations +

Proceedings Volume 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave; 77314O (2010) https://doi.org/10.1117/12.856945
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

Jun Nishikawa, Kaito Yokochi, Naoshi Murakami, Lyu Abe, Takayuki Kotani, Motohide Tamura, Takashi Kurokawa, Alexander V. Tavrov, Mitsuo Takeda, and Hiroshi Murakami "A coronagraph system with unbalanced nulling interferometer: progress of wavefront correction", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77314O (10 August 2010); https://doi.org/10.1117/12.856945

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