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Paper Abstract

As adaptive optics (AO) matures, it becomes possible to envision AO systems oriented towards specific important scientific goals rather than general-purpose systems. One such goal for the next decade is the direct imaging detection of extrasolar planets. An "extreme" adaptive optics (ExAO) system optimized for extrasolar planet detection will have very high actuator counts and rapid update rates - designed for observations of bright stars - and will require exquisite internal calibration at the nanometer level. In addition to extrasolar planet detection, such a system will be capable of characterizing dust disks around young or mature stars, outflows from evolved stars, and high Strehl ratio imaging even at visible wavelengths. The NSF Center for Adaptive Optics has carried out a detailed conceptual design study for such an instrument, dubbed the eXtreme Adaptive Optics Planet Imager or XAOPI. XAOPI is a 4096-actuator AO system, notionally for the Keck telescope, capable of achieving contrast ratios >107 at angular separations of 0.2-1". ExAO system performance analysis is quite different than conventional AO systems - the spatial and temporal frequency content of wavefront error sources is as critical as their magnitude. We present here an overview of the XAOPI project, and an error budget highlighting the key areas determining achievable contrast. The most challenging requirement is for residual static errors to be less than 2 nm over the controlled range of spatial frequencies. If this can be achieved, direct imaging of extrasolar planets will be feasible within this decade.

Paper Details

Date Published: 25 October 2004
PDF: 11 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.552188
Show Author Affiliations
Bruce A. Macintosh, NSF Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
Brian Bauman, NSF Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
Julia Wilhelmsen Evans, NSF Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
James R. Graham, NSF Ctr. for Adaptive Optics (United States)
Univ. of California/Berkeley (United States)
Christopher Lockwood, Univ. of California/Santa Cruz (United States)
Lisa Poyneer, NSF Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
Daren Dillon, Univ. of California/Santa Cruz (United States)
Don T. Gavel, NSF Ctr. for Adaptive Optics (United States)
Univ. of California/Santa Cruz (United States)
Joseph J. Green, Jet Propulsion Lab. (United States)
James P. Lloyd, NSF Ctr. for Adaptive Optics (United States)
California Institute of Technology (United States)
Russell B Makidon, NSF Ctr. for Adaptive Optics (United States)
Space Telescope Science Institute (United States)
Scot Olivier, NSF Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
Dave Palmer, NSF Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
Marshall D. Perrin, NSF Ctr. for Adaptive Optics (United States)
Univ. of California/Berkeley (United States)
Scott Severson, NSF Ctr. for Adaptive Optics (United States)
Univ. of California/Santa Cruz (United States)
Andrew I. Sheinis, NSF Ctr. for Adaptive Optics (United States)
Univ. of California/Santa Cruz (United States)
Anand Sivaramakrishnan, NSF Ctr. for Adaptive Optics (United States)
Space Telescope Science Institute (United States)
Gary Sommargren, NSF Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
Remi Soummer, NSF Ctr. for Adaptive Optics (United States)
Space Telescope Science Institute (United States)
Mitchell Troy, NSF Ctr. for Adaptive Optics (United States)
Jet Propulsion Lab. (United States)
J. Kent Wallace, NSF Ctr. for Adaptive Optics (United States)
Jet Propulsion Lab. (United States)
Edward Wishnow, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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