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Proceedings Paper

The Subaru Coronographic Extreme AO (SCExAO) system: implementation and performances of the Coronographic Low Order WaveFront Sensor
Author(s): Frédéric Vogt; Frantz Martinache; Olivier Guyon; Takashi Yoshikawa; Kaito Yokochi; Vincent Garrel; Taro Matsuo
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Paper Abstract

The Subaru Coronagraphic Extreme AO project (SCExAO) is a high performance coronagraph designed to deliver high contrast at small angular separation. For the detection of structures near the diffraction limit, an accurate control of low order wavefront aberrations - tip-tilt and focus - is essential as these aberrations create light leaks that are the source of confusion in the final science image. To address this major difficulty, we have equipped SCExAO with a specially designed Coronagraphic Low Order WaveFront Sensor (CLOWFS) using defocused images of a reflective ring located in the focal plane, that can track tip-tilt errors as small as 10-3λ/D. CLOWFS was originally designed to drive actuators in a closed-loop. Here, we show that it can also be used in post-processing to efficiently subtract the tip-tilt induced coronagraphic leaks in the final science image.

Paper Details

Date Published: 28 July 2010
PDF: 8 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 773612 (28 July 2010); doi: 10.1117/12.857915
Show Author Affiliations
Frédéric Vogt, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Lab. d'Astrophysique, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Frantz Martinache, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Takashi Yoshikawa, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Univ. of Tokyo (Japan)
Kaito Yokochi, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Tokyo Univ. of Agriculture and Technology (Japan)
Vincent Garrel, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Taro Matsuo, Subaru Telescope, National Astronomical Observatory of Japan (United States)


Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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