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