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Proceedings Paper

Effects of diffraction and static wavefront errors on high-contrast imaging from the Thirty Meter Telescope
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Paper Abstract

High-contrast imaging, particularly direct detection of extrasolar planets, is a major science driver for the next generation of extremely large telescopes such as the segmented Thirty Meter Telescope. This goal requires more than merely diffraction-limited imaging, but also attention to residual scattered light from wavefront errors and diffraction effects at the contrast level of 10-8-10-9. Using a wave-optics simulation of adaptive optics and a diffraction suppression system we investigate diffraction from the segmentation geometry, intersegment gaps, obscuration by the secondary mirror and its supports. We find that the large obscurations pose a greater challenge than the much smaller segment gaps. In addition the impact of wavefront errors from the primary mirror, including segment alignment and figure errors, are analyzed. Segment-to-segment reflectivity variations and residual segment figure error will be the dominant error contributors from the primary mirror. Strategies to mitigate these errors are discussed.

Paper Details

Date Published: 28 June 2006
PDF: 11 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 62722C (28 June 2006); doi: 10.1117/12.671667
Show Author Affiliations
Mitchell Troy, Jet Propulsion Lab. (United States)
Ian Crossfield, Jet Propulsion Lab. (United States)
Gary Chanan, Univ. of California, Irvine (United States)
Philip Dumont, Jet Propulsion Lab. (United States)
Joseph J. Green, Jet Propulsion Lab. (United States)
Bruce Macintosh, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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