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Optimal apodizations for on-axis vector vortex coronagraphs

Fogarty, Kevin and Pueyo, Laurent and Mawet, Dimitri (2014) Optimal apodizations for on-axis vector vortex coronagraphs. In: Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.9143. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 914326.

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Imaging planets requires instruments capable of dealing with extreme contrast ratios and that have a high resolution. Coronagraphs that can reach a contrast ratio in a neighborhood of 10^9 will be capable of observing Jupiter-like planets, while those with a contrast greater than a benchmark number of 10^(10) to within a few λ/D of an on-axis star will render possible imaging of Earth-like planets. Plans for achieving this feat have been developed for use on telescopes with unobscured, circularly symmetric apertures. However; given that the next generation of large telescopes are on-axis designs with support structures in the telescope aperture and a central obstruction due to the secondary mirror, it has proven necessary to develop coronagraphic techniques that compensate for obstructions. Pueyo and Norman (2012) present a possible solution to the problem of the support structures using ACAD. In this paper, we present a coronagraphic design that uses a vector vortex and pupil apodization to compensate for the secondary mirror that could possibly be used in conjunction with a wavefront control system and/or ACAD. This coronagraph is capable of achieving a contrast ratio of at least 10^(10) in a working angle of (1:5 - 30) λ/D in conjunction with an on-axis telescope. We can construct our pupil using a classical transmissive apodizer or pupil remapping. We find that the mirror shapes required are relatively simple (requiring ≤ 40 degrees of freedom to describe) and we expect they will be feasible to manufacture, and potentially even to implement with deformable mirrors. By combining existing high-contrast imaging techniques, we demonstrate that a relatively simple design may be used to image exo-Earths.

Item Type:Book Section
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URLURL TypeDescription
Fogarty, Kevin0000-0002-2691-2476
Pueyo, Laurent0000-0003-3818-408X
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). August 2, 2014. This work was carried out in part for the Fourier Optics course (AS.171.755), and I am grateful for the guidance of course instructors Ron Allen and Anand Sivaramakrishnan. This material is also partially based upon work carried out under subcontract 1496556 with the Jet Propulsion Laboratory funded by NASA and administered by the California Institute of Technology.
Funding AgencyGrant Number
Fourier Optics course (AS.171.755)UNSPECIFIED
Subject Keywords:Vector Vortex Coronagraph, On-Axis Telescopes, PIAA, Earthlike Exoplanet Imaging
Series Name:Proceedings of SPIE
Issue or Number:9143
Record Number:CaltechAUTHORS:20150520-151205215
Persistent URL:
Official Citation:Kevin Fogarty ; Laurent Pueyo and Dimitri Mawet " Optimal apodizations for on-axis vector vortex coronagraphs ", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 914326 (August 2, 2014); doi:10.1117/12.2056760;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57723
Deposited On:20 May 2015 23:05
Last Modified:10 Nov 2021 21:54

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