Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: Current status and ongoing developments

Ananya Sahoo; Olivier Guyon; Christophe S. Clergeon; Nour Skaf; Yosuke Minowa; Julien Lozi; Nemanja Jovanovic; Frantz Martinache

doi:10.1117/12.2314333

Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: Current status and ongoing developments

Ananya Sahoo, Olivier Guyon, Christophe S. Clergeon, Nour Skaf, Yosuke Minowa, Julien Lozi, Nemanja Jovanovic, Frantz Martinache

Optical Sciences

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

9 Scopus citations

Abstract

Exoplanet imaging requires excellent wavefront correction and calibration. At the Subaru telescope this is achieved us- ing the 188-element facility adaptive optics system(AO188) feeding the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument; a multipurpose instrument built to deliver high contrast images of planets and disks around nearby stars. AO188 offers coarse correction while SCExAO performs fine correction and calibration of 1000 modes. The full system achieves 90%Strehl Ratio in H-band and diffraction limited images. A new Real Time Computer allowing higher performance between SCExAO and AO188 is currently implemented. Future upgrades will include a new Pyramid Wavefront Sensor and (64x64) DM to achieve extreme AO correction inside AO188. We are progressing in the development of predictive control and sensor fusion algorithms across the system to improve performance and calibration. With the new upgrades, SCExAO will be able to image giant planets in reflected light with Subaru and validate technologies necessary to image habitable Earth-like planets with the Thirty Meter Telescope (TMT).

Original language	English (US)
Title of host publication	Adaptive Optics Systems VI
Editors	Dirk Schmidt, Laura Schreiber, Laird M. Close
Publisher	SPIE
ISBN (Print)	9781510619593
DOIs	https://doi.org/10.1117/12.2314333
State	Published - 2018
Event	Adaptive Optics Systems VI 2018 - Austin, United States Duration: Jun 10 2018 → Jun 15 2018

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	10703
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Adaptive Optics Systems VI 2018
Country/Territory	United States
City	Austin
Period	6/10/18 → 6/15/18

Keywords

adaptive optics
astronomical instrumentations
exoplanet
wavefront control
wavefront sensors

ASJC Scopus subject areas

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

Access to Document

10.1117/12.2314333

Cite this

Sahoo, A., Guyon, O., Clergeon, C. S., Skaf, N., Minowa, Y., Lozi, J., Jovanovic, N., & Martinache, F. (2018). Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: Current status and ongoing developments. In D. Schmidt, L. Schreiber, & L. M. Close (Eds.), Adaptive Optics Systems VI Article 1070350 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10703). SPIE. https://doi.org/10.1117/12.2314333

Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: Current status and ongoing developments. / Sahoo, Ananya; Guyon, Olivier; Clergeon, Christophe S. et al.
Adaptive Optics Systems VI. ed. / Dirk Schmidt; Laura Schreiber; Laird M. Close. SPIE, 2018. 1070350 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10703).

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

Sahoo, A, Guyon, O, Clergeon, CS, Skaf, N, Minowa, Y, Lozi, J, Jovanovic, N & Martinache, F 2018, Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: Current status and ongoing developments. in D Schmidt, L Schreiber & LM Close (eds), Adaptive Optics Systems VI., 1070350, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10703, SPIE, Adaptive Optics Systems VI 2018, Austin, United States, 6/10/18. https://doi.org/10.1117/12.2314333

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abstract = "Exoplanet imaging requires excellent wavefront correction and calibration. At the Subaru telescope this is achieved us- ing the 188-element facility adaptive optics system(AO188) feeding the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument; a multipurpose instrument built to deliver high contrast images of planets and disks around nearby stars. AO188 offers coarse correction while SCExAO performs fine correction and calibration of 1000 modes. The full system achieves 90%Strehl Ratio in H-band and diffraction limited images. A new Real Time Computer allowing higher performance between SCExAO and AO188 is currently implemented. Future upgrades will include a new Pyramid Wavefront Sensor and (64x64) DM to achieve extreme AO correction inside AO188. We are progressing in the development of predictive control and sensor fusion algorithms across the system to improve performance and calibration. With the new upgrades, SCExAO will be able to image giant planets in reflected light with Subaru and validate technologies necessary to image habitable Earth-like planets with the Thirty Meter Telescope (TMT).",

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Subaru Coronagraphic Extreme-AO (SCExAO) wavefront control: Current status and ongoing developments

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Keywords

ASJC Scopus subject areas

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