The vector-apodizing phase plate coronagraph: design, current performance, and future development

[en] Over the last decade, the vector-apodizing phase plate (vAPP) coronagraph has been developed from concept to on-sky application in many high-contrast imaging systems on 8-m class telescopes. The vAPP is an geometric-phase patterned coronagraph that is inherently broadband, and its manufacturing is enabled only by direct-write technology for liquid-crystal patterns. The vAPP generates two coronagraphic PSFs that cancel starlight on opposite sides of the point spread function (PSF) and have opposite circular polarization states. The efficiency, that is the amount of light in these PSFs, depends on the retardance offset from half-wave of the liquid-crystal retarder. Using different liquid-crystal recipes to tune the retardance, different vAPPs operate with high efficiencies ($>96\%$) in the visible and thermal infrared (0.55 µm to 5 µm). Since 2015, seven vAPPs have been installed in a total of six different instruments, including Magellan/MagAO, Magellan/MagAO-X, Subaru/SCExAO, and LBT/LMIRcam. Using two integral field spectrographs installed on the latter two instruments, these vAPPs can provide low-resolution spectra (R$\sim$30) between 1 µm and 5 µm. We review the design process, development, commissioning, on-sky performance, and first scientific results of all commissioned vAPPs. We report on the lessons learned and conclude with perspectives for future developments and applications.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Doelman, D. S.

Snik, F.

Por, E. H.

Bos, S. P.

Otten, G. P. P. L.

Kenworthy, M.

Haffert, S. Y.

Wilby, M.

Bohn, A. J.

Sutlieff, B. J.

More authors (42 more)

Language :

English

Title :

The vector-apodizing phase plate coronagraph: design, current performance, and future development

Publication date :

13 May 2021

Journal title :

Applied Optics

ISSN :

0003-6935

Publisher :

Optical Society of America, Washington, United States - District of Columbia

Volume :

Issue :

Pages :

D52-D72

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://ui.adsabs.harvard.edu/abs/2021arXiv210411211D

European Projects :

H2020 - 678194 - FALCONER - Forging Advanced Liquid-Crystal Coronagraphs Optimized for Novel Exoplanet Research

Funders :

EC - European Commission

Available on ORBi :

since 29 April 2021

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