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Proceedings Paper

Contrast improvement with imperfect pre-coronagraph and dark-hole
Author(s): Jun Nishikawa; Masahito Oya; Naoshi Murakami; Motohide Tamura; Takashi Kurokawa; Yosuke Tanaka; Shiomi Kumagai; Takayuki Kotani
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Paper Abstract

We are studying a coronagraph system with an imperfect pre-coronagraph in the field of direct detection of exoplanets which can provide additional contrast to a main coronagraph. It is a kind of an unbalanced nulling interferometer (UNI) concept which consists of the first deformable mirror (DM), the pre-coronagraph, the second DM, and a main coronagraph. The pre-coronagraph and the DM1 reduce the star light and the speckle noise to about one-hundreds which would be added to the main coronagraph contrast. The DMs can be controlled by the dark-hole algorithm by changing the masks at the coronagraph foci.

Paper Details

Date Published: 1 August 2016
PDF: 6 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99043E (1 August 2016); doi: 10.1117/12.2232920
Show Author Affiliations
Jun Nishikawa, National Astronomical Observatory of Japan (Japan)
SOKENDAI (Japan)
National Institutes of Natural Sciences (Japan)
Masahito Oya, Nihon Univ. (Japan)
Naoshi Murakami, Hokkaido Univ. (Japan)
Motohide Tamura, The Univ. of Tokyo (Japan)
National Astronomical Observatory of Japan (Japan)
National Institutes of Natural Sciences (Japan)
Takashi Kurokawa, Tokyo Univ. of Agriculture and Technology (Japan)
National Astronomical Observatory of Japan (Japan)
Yosuke Tanaka, Tokyo Univ. of Agriculture and Technology (Japan)
Shiomi Kumagai, Nihon Univ. (Japan)
Takayuki Kotani, National Institutes of Natural Sciences (Japan)
National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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