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Central-Obscuration Removal Plates for Focal-Plane Phase-Mask Coronagraphs with a Centrally-Obscured Telescope

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Title: Central-Obscuration Removal Plates for Focal-Plane Phase-Mask Coronagraphs with a Centrally-Obscured Telescope
Authors: Oshiyama, Fumika Browse this author
Murakami, Naoshi Browse this author →KAKEN DB
Guyon, Olivier Browse this author
Martinache, Frantz Browse this author
Baba, Naoshi Browse this author
Matsuo, Taro Browse this author
Nishikawa, Jun Browse this author
Tamura, Motohide Browse this author
Keywords: Astronomical Instrumentation
Issue Date: 1-Mar-2014
Publisher: The University of Chicago Press
Journal Title: Publications of the Astronomical Society of the Pacific
Volume: 126
Issue: 937
Start Page: 270
End Page: 279
Publisher DOI: 10.1086/675807
Abstract: Focal-plane phase-mask coronagraphs, such as eight-octant phase-mask coronagraphs (8OPM), are one of the most promising tools for high contrast observations. However, coronagraphic performance would be degraded when combined with a centrally-obscured telescope. We propose pupil-remapping optics for removing the shade of a secondary mirror to generate a clear, circular pupil for the phase-mask coronagraph. First, we show the design of the pupil-remapping optics, called central-obscuration removal plates (CRPs). Next, we report laboratory experiments on the 8OPM coronagraph using manufactured CRPs. We also evaluate off-axis point-spread functions via both laboratory experiments and numerical simulations. Finally, we evaluate, via numerical simulations, limiting factors for coronagraphic performance, such as phase aberrations introduced by the CRPs, the effect of Fresnel diffraction, and chromatic behavior. The numerical simulations suggest that the phase aberrations could be a dominant limiting factor of the achievable contrast in the current laboratory experiments.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 村上 尚史

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