Combination of apodized pupil and phase mask coronagraph for SCExAO at Subaru Telescope
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.
Additional Information
© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was supported partly by JSPS KAKENHI (Grant Number 19H01932) and Astrobiology Center Project (AB301009). Experiments were made at a lab in the Advanced Technology Center of the NAOJ.Attached Files
Published - 114474T.pdf
Presentation - SPIE-AS20-8dcba2b6-e703-ea11-813b-005056be78dc.pdf
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Additional details
- Eprint ID
- 107185
- Resolver ID
- CaltechAUTHORS:20201218-082742321
- 19H01932
- Japan Society for the Promotion of Science (JSPS)
- AB301009
- National Institutes of Natural Sciences of Japan
- Created
-
2020-12-18Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 11447