Contrast improvement with imperfect pre-coronagraph and dark-hole

Jun Nishikawa; Masahito Oya; Naoshi Murakami; Motohide Tamura; Takashi Kurokawa; Yosuke Tanaka; Shiomi Kumagai; Takayuki Kotani

doi:10.1117/12.2232920

1 August 2016 Contrast improvement with imperfect pre-coronagraph and dark-hole

Jun Nishikawa, Masahito Oya, Naoshi Murakami, Motohide Tamura, Takashi Kurokawa, Yosuke Tanaka, Shiomi Kumagai, Takayuki Kotani

Author Affiliations +

Proceedings Volume 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave; 99043E (2016) https://doi.org/10.1117/12.2232920
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

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Jun Nishikawa, Masahito Oya, Naoshi Murakami, Motohide Tamura, Takashi Kurokawa, Yosuke Tanaka, Shiomi Kumagai, and Takayuki Kotani "Contrast improvement with imperfect pre-coronagraph and dark-hole", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99043E (1 August 2016); https://doi.org/10.1117/12.2232920

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