1 August 2016 Contrast improvement with imperfect pre-coronagraph and dark-hole
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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jun Nishikawa, Jun Nishikawa, Masahito Oya, Masahito Oya, Naoshi Murakami, Naoshi Murakami, Motohide Tamura, Motohide Tamura, Takashi Kurokawa, Takashi Kurokawa, Yosuke Tanaka, Yosuke Tanaka, Shiomi Kumagai, Shiomi Kumagai, Takayuki Kotani, 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); doi: 10.1117/12.2232920; https://doi.org/10.1117/12.2232920

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