The Subaru Coronographic Extreme AO (SCExAO) system: implementation and performances of the Coronographic Low Order WaveFront Sensor

Frédéric Vogt; Frantz Martinache; Olivier Guyon; Takashi Yoshikawa; Kaito Yokochi; Vincent Garrel; Taro Matsuo

doi:10.1117/12.857915

28 July 2010 The Subaru Coronographic Extreme AO (SCExAO) system: implementation and performances of the Coronographic Low Order WaveFront Sensor

Frédéric Vogt, Frantz Martinache, Olivier Guyon, Takashi Yoshikawa, Kaito Yokochi, Vincent Garrel, Taro Matsuo

Author Affiliations +

Proceedings Volume 7736, Adaptive Optics Systems II; 773612 (2010) https://doi.org/10.1117/12.857915
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

Frédéric Vogt, Frantz Martinache, Olivier Guyon, Takashi Yoshikawa, Kaito Yokochi, Vincent Garrel, and Taro Matsuo "The Subaru Coronographic Extreme AO (SCExAO) system: implementation and performances of the Coronographic Low Order WaveFront Sensor", Proc. SPIE 7736, Adaptive Optics Systems II, 773612 (28 July 2010); https://doi.org/10.1117/12.857915

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