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Fast Linearized Coronagraph Optimizer (FALCO) IV. Coronagraph design survey for obstructed and segmented apertures

Ruane, G. and Riggs, A. and Coker, C. T. and Shaklan, S. B. and Sidick, E. and Mawet, D. and Jewell, J. and Balasubramanian, K. and Stark, C. C. (2018) Fast Linearized Coronagraph Optimizer (FALCO) IV. Coronagraph design survey for obstructed and segmented apertures. In: Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave. Proceedings of SPIE. No.10698. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 106984U. ISBN 9781510619494.

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Coronagraph instruments on future space telescopes will enable the direct detection and characterization of Earth-like exoplanets around Sun-like stars for the first time. The quest for the optimal optical coronagraph designs has made rapid progress in recent years thanks to the Segmented Coronagraph Design and Analysis (SCDA) initiative led by the Exoplanet Exploration Program at NASA's Jet Propulsion Laboratory. As a result, several types of high-performance designs have emerged that make use of dual deformable mirrors to (1) correct for optical aberrations and (2) suppress diffracted starlight from obstructions and discontinuities in the telescope pupil. However, the algorithms used to compute the optimal deformable mirror surface tend to be computationally intensive, prohibiting large scale design surveys. Here, we utilize the Fast Linearized Coronagraph Optimizer (FALCO), a tool that allows for rapid optimization of deformable mirror shapes, to explore trade-offs in coronagraph designs for obstructed and segmented space telescopes. We compare designs for representative shaped pupil Lyot and vortex coronagraphs, two of the most promising concepts for the LUVOIR space mission concept. We analyze the optical performance of each design, including their throughput and ability to passively suppress light from partially resolved stars in the presence of low-order aberrations. Our main result is that deformable mirror based apodization can suffciently suppress diffraction from support struts and inter-segment gaps whose widths are on the order of ~0.1% of the primary mirror diameter to detect Earth-sized planets within a few tens of milliarcseconds from the star.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Ruane, G.0000-0003-4769-1665
Coker, C. T.0000-0002-9954-7887
Mawet, D.0000-0002-8895-4735
Additional Information:© 2018 Society of Photo-optical Instrumentation Engineers (SPIE). G. Ruane is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1602444. This work was supported by the Exoplanet Exploration Program (ExEP), Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA.
Group:Astronomy Department
Funding AgencyGrant Number
NSF Astronomy and Astrophysics FellowshipAST-1602444
Subject Keywords:High contrast imaging, instrumentation, exoplanets, direct detection, coronagraphs
Series Name:Proceedings of SPIE
Issue or Number:10698
Record Number:CaltechAUTHORS:20180723-152618824
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Official Citation:G. Ruane, A. Riggs, C. T. Coker, S. B. Shaklan, E. Sidick, D. Mawet, J. Jewell, K. Balasubramanian, C. C. Stark, "Fast linearized coronagraph optimizer (FALCO) IV: coronagraph design survey for obstructed and segmented apertures," Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106984U (21 August 2018); doi: 10.1117/12.2312973
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88140
Deposited By: Joy Painter
Deposited On:24 Jul 2018 14:52
Last Modified:09 Mar 2020 13:18

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