Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope

Jun Nishikawa; Naoshi Murakami; Julien Lozi; Olivier Guyon; Keiichiro Habu; Hikaru Ichien; Kenta Yoneta; Seiji Sudo; Kosuke Kumaki; Shiomi Kumagaih; Nemanja Jovanovic; Frantz Martinache

doi:10.1117/12.2560839

Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope

Jun Nishikawa, Naoshi Murakami, Julien Lozi, Olivier Guyon, Keiichiro Habu, Hikaru Ichien, Kenta Yoneta, Seiji Sudo, Kosuke Kumaki, Shiomi Kumagaih, Nemanja Jovanovic, Frantz Martinache

Optical Sciences

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

2 Scopus citations

Abstract

Subaru telescope has been operating a high-contrast imaging instruments called Subaru coronagraphic extreme adaptive optics (SCExAO) which is used for exoplanet research. We are developing phase mask coronagraphs using photonic crystal wave plates inside the SCExAO. An eight-octant phase mask (8OPM) of three-layer achromatic structure has been fabricated as a second generation. It was designed for J and H band to reach 10^-5 contrast, and Ks band to 10^-4. A retardation and a coronagraphic performance of the 8OPM were confirmed almost as designed at 1550nm. An apodised (binary shaped) pupil to be used with the 8OPM was also studied to suppress diffracted light by the secondary shadow and spiders. We confirmed a performance of the combination of the apodizer and the 8OPM at visible wavelengths in a lab. We optimized the apodizer for a pupil of the SCExAO where we obtained a transmission of 50 % and a contrast of 10^-4 at the center and 10^-6 at outer region. We manufactured the designed apodizer to be installed in SCExAO for infrared observations.

Original language	English (US)
Title of host publication	Ground-Based and Airborne Instrumentation for Astronomy VIII
Editors	Christopher J. Evans, Julia J. Bryant, Kentaro Motohara
Publisher	SPIE
ISBN (Electronic)	9781510636811
DOIs	https://doi.org/10.1117/12.2560839
State	Published - 2020
Event	Ground-Based and Airborne Instrumentation for Astronomy VIII 2020 - Virtual, Online, United States Duration: Dec 14 2020 → Dec 22 2020

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11447
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Ground-Based and Airborne Instrumentation for Astronomy VIII 2020
Country/Territory	United States
City	Virtual, Online
Period	12/14/20 → 12/22/20

Keywords

Adaptive optics
Apodizer
Coronagraph
Exoplanet
Phase mask
Shaped pupil

ASJC Scopus subject areas

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

Access to Document

10.1117/12.2560839

Cite this

Nishikawa, J., Murakami, N., Lozi, J., Guyon, O., Habu, K., Ichien, H., Yoneta, K., Sudo, S., Kumaki, K., Kumagaih, S., Jovanovic, N., & Martinache, F. (2020). Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope. In C. J. Evans, J. J. Bryant, & K. Motohara (Eds.), Ground-Based and Airborne Instrumentation for Astronomy VIII Article 114474T (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11447). SPIE. https://doi.org/10.1117/12.2560839

Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope. / Nishikawa, Jun; Murakami, Naoshi; Lozi, Julien et al.
Ground-Based and Airborne Instrumentation for Astronomy VIII. ed. / Christopher J. Evans; Julia J. Bryant; Kentaro Motohara. SPIE, 2020. 114474T (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11447).

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

Nishikawa, J, Murakami, N, Lozi, J, Guyon, O, Habu, K, Ichien, H, Yoneta, K, Sudo, S, Kumaki, K, Kumagaih, S, Jovanovic, N & Martinache, F 2020, Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope. in CJ Evans, JJ Bryant & K Motohara (eds), Ground-Based and Airborne Instrumentation for Astronomy VIII., 114474T, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11447, SPIE, Ground-Based and Airborne Instrumentation for Astronomy VIII 2020, Virtual, Online, United States, 12/14/20. https://doi.org/10.1117/12.2560839

Nishikawa J, Murakami N, Lozi J, Guyon O, Habu K, Ichien H et al. Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope. In Evans CJ, Bryant JJ, Motohara K, editors, Ground-Based and Airborne Instrumentation for Astronomy VIII. SPIE. 2020. 114474T. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2560839

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abstract = "Subaru telescope has been operating a high-contrast imaging instruments called Subaru coronagraphic extreme adaptive optics (SCExAO) which is used for exoplanet research. We are developing phase mask coronagraphs using photonic crystal wave plates inside the SCExAO. An eight-octant phase mask (8OPM) of three-layer achromatic structure has been fabricated as a second generation. It was designed for J and H band to reach 10-5 contrast, and Ks band to 10-4. A retardation and a coronagraphic performance of the 8OPM were confirmed almost as designed at 1550nm. An apodised (binary shaped) pupil to be used with the 8OPM was also studied to suppress diffracted light by the secondary shadow and spiders. We confirmed a performance of the combination of the apodizer and the 8OPM at visible wavelengths in a lab. We optimized the apodizer for a pupil of the SCExAO where we obtained a transmission of 50 % and a contrast of 10-4 at the center and 10-6 at outer region. We manufactured the designed apodizer to be installed in SCExAO for infrared observations.",

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AU - Nishikawa, Jun

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AU - Lozi, Julien

AU - Guyon, Olivier

AU - Habu, Keiichiro

AU - Ichien, Hikaru

AU - Yoneta, Kenta

AU - Sudo, Seiji

AU - Kumaki, Kosuke

AU - Kumagaih, Shiomi

AU - Jovanovic, Nemanja

AU - Martinache, Frantz

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AB - Subaru telescope has been operating a high-contrast imaging instruments called Subaru coronagraphic extreme adaptive optics (SCExAO) which is used for exoplanet research. We are developing phase mask coronagraphs using photonic crystal wave plates inside the SCExAO. An eight-octant phase mask (8OPM) of three-layer achromatic structure has been fabricated as a second generation. It was designed for J and H band to reach 10-5 contrast, and Ks band to 10-4. A retardation and a coronagraphic performance of the 8OPM were confirmed almost as designed at 1550nm. An apodised (binary shaped) pupil to be used with the 8OPM was also studied to suppress diffracted light by the secondary shadow and spiders. We confirmed a performance of the combination of the apodizer and the 8OPM at visible wavelengths in a lab. We optimized the apodizer for a pupil of the SCExAO where we obtained a transmission of 50 % and a contrast of 10-4 at the center and 10-6 at outer region. We manufactured the designed apodizer to be installed in SCExAO for infrared observations.

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KW - Phase mask

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ER -

Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope

Abstract

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Conference

Keywords

ASJC Scopus subject areas

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