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Coronagraph design for an extreme adaptive optics system with spatially filtered wavefront sensing on segmented telescopes

Sivaramakrishnan, Anand and Makidon, Russell B. and Soummer, Rémi and Macintosh, Bruce A. and Troy, Mitchell and Chanan, Gary A. and Lloyd, James P. and Perrin, Marshall D. and Graham, James R. and Poyneer, Lisa and Sheinis, Andrew (2004) Coronagraph design for an extreme adaptive optics system with spatially filtered wavefront sensing on segmented telescopes. In: Advancements in Adaptive Optics. Proceedings of SPIE. No.5490. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 535-544. ISBN 9780819454225.

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High dynamic range coronagraphy targeted at discovering planets around nearby stars is often associated with monolithic, unobstructed aperture space telescopes. With the advent of extreme adaptive optics (ExAO) systems with thousands of sensing and correcting channels, the benefits of placing a near-infrared coronagraph on a large segmented mirror telescope become scientifically interesting. This is because increased aperture size produces a tremendous gain in achievable contrast at the same angular distance from a point source at Strehl ratios in excess of 90\% (and at lower Strehl ratios on future giant telescopes such as the Thirty Meter Telescope). We outline some of the design issues facing such a coronagraph, and model a band-limited coronagraph on an aperture with a Keck-like pupil. We examine the purely diffractive challenges facing the eXtreme AO Planetary Imager (XAOPI) given the Keck pupil geometry, notably its inter-segment gap spacing of 6~mm. Classical Lyot coronagraphs, with hard-edged occulting stops, are not efficient enough at suppressing diffracted light, given XAOPI's scientific goal of imaging a young Jupiter at a separation as close as 0.15 arcseconds (4λD at H on Keck) from its parent star. With a 4000 channel ExAO system using an anti-aliased spatially-filtered wavefront sensor planned for XAOPI, we wish to keep diffracted light due to coronagraphic design at least as low as the noise floor set by AO system limitations. We study the band-limited Lyot coronagraph (BLC) as a baseline design instead of the classical design because of its efficient light suppression, as well as its analytical simplicity. We also develop ways of investigating tolerancing coronagraphic mask fabrication by utilizing the BLC design's mathematical tractability.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Soummer, Rémi0000-0003-2753-2819
Macintosh, Bruce A.0000-0003-1212-7538
Perrin, Marshall D.0000-0002-3191-8151
Additional Information:© 2004 Society of Photo-optical Instrumentation Engineers (SPIE). R.S. and M.D.P. are supported by NASA Michelson Postdoctoral and Graduate Fellowships, respectively, under contract to the Jet Propulsion Laboratory (JPL) funded by NASA. The JPL is managed for NASA by the California Institute of Technology, and J.P.L. is supported by the California Institute of Technology’s Millikan fellowship. We acknowledge support from the Space Telescope Science Institute’s Director’s Discretionary Research Fund, Research Programs Office, and Visitors Program, NSF grant AST-0088316, the National Science Foundation Science and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz under cooperative agreement No. AST-9876783.
Funding AgencyGrant Number
NASA Postdoctoral FellowshipUNSPECIFIED
NASA Graduate FellowshipUNSPECIFIED
Caltech Millikan FellowshipUNSPECIFIED
Space Telescope Science InstituteUNSPECIFIED
Subject Keywords:segmented mirror coronagraphy, Lyot coronagraphy, band-limited coronagraph, Extreme AO, Keck, TMT
Series Name:Proceedings of SPIE
Issue or Number:5490
Record Number:CaltechAUTHORS:20190116-160531401
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Official Citation:Anand Sivaramakrishnan, Russell B. Makidon, Remi Soummer, Bruce A. Macintosh, Mitchell Troy, Gary A. Chanan, James P. Lloyd, Marshall D. Perrin, James R. Graham, Lisa Poyneer, Andrew I. Sheinis, "Coronagraph design for an extreme adaptive optics system with spatially filtered wavefront sensing on segmented telescopes," Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551939
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92330
Deposited By: Tony Diaz
Deposited On:17 Jan 2019 21:50
Last Modified:16 Nov 2021 03:49

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