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

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

8 Scopus citations

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.

Original language	English (US)
Title of host publication	Adaptive Optics Systems II
Edition	PART 1
DOIs	https://doi.org/10.1117/12.857915
State	Published - 2010
Externally published	Yes
Event	Adaptive Optics Systems II - San Diego, CA, United States Duration: Jun 27 2010 → Jul 2 2010

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Number	PART 1
Volume	7736
ISSN (Print)	0277-786X

Other

Other	Adaptive Optics Systems II
Country/Territory	United States
City	San Diego, CA
Period	6/27/10 → 7/2/10

Keywords

Adaptive optics
CLOWFS
Coronography
Extrasolar planets
PIAA
SCExAO
Subaru telescope

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.857915

Cite this

Vogt, F., Martinache, F., Guyon, O., Yoshikawa, T., Yokochi, K., Garrel, V., & Matsuo, T. (2010). The subaru coronographic extreme AO (SCExAO) system: Implementation and performances of the coronographic low order WaveFront sensor. In Adaptive Optics Systems II (PART 1 ed.). Article 773612 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7736, No. PART 1). https://doi.org/10.1117/12.857915

The subaru coronographic extreme AO (SCExAO) system: Implementation and performances of the coronographic low order WaveFront sensor. / Vogt, Frédéric; Martinache, Frantz; Guyon, Olivier et al.
Adaptive Optics Systems II. PART 1. ed. 2010. 773612 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7736, No. PART 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Vogt, F, Martinache, F, Guyon, O, Yoshikawa, T, Yokochi, K, Garrel, V & Matsuo, T 2010, The subaru coronographic extreme AO (SCExAO) system: Implementation and performances of the coronographic low order WaveFront sensor. in Adaptive Optics Systems II. PART 1 edn, 773612, Proceedings of SPIE - The International Society for Optical Engineering, no. PART 1, vol. 7736, Adaptive Optics Systems II, San Diego, CA, United States, 6/27/10. https://doi.org/10.1117/12.857915

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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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AB - 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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The subaru coronographic extreme AO (SCExAO) system: Implementation and performances of the coronographic low order WaveFront sensor

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Keywords

ASJC Scopus subject areas

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