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 Sudoh; Kosuke Kumaki; Shiomi Kumagai; Nemanja Jovanovic; Frantz Martinache

doi:10.1117/12.2560839

13 December 2020 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 Sudoh, Kosuke Kumaki, Shiomi Kumagai, Nemanja Jovanovic, Frantz Martinache

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114474T (2020) https://doi.org/10.1117/12.2560839
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

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 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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Jun Nishikawa, Naoshi Murakami, Julien Lozi, Olivier Guyon, Keiichiro Habu, Hikaru Ichien, Kenta Yoneta, Seiji Sudoh, Kosuke Kumaki, Shiomi Kumagai, Nemanja Jovanovic, and Frantz Martinache "Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114474T (13 December 2020); https://doi.org/10.1117/12.2560839

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