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Proceedings Paper

Extreme adaptive optics testbed: results and future work
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Paper Abstract

"Extreme" adaptive optics systems are optimized for ultra-high-contrast applications, such as ground-based extrasolar planet detection. The Extreme Adaptive Optics Testbed at UC Santa Cruz is being used to investigate and develop technologies for high-contrast imaging, especially wavefront control. A simple optical design allows us to minimize wavefront error and maximize the experimentally achievable contrast before progressing to a more complex set-up. A phase shifting diffraction interferometer is used to measure wavefront errors with sub-nm precision and accuracy. We have demonstrated RMS wavefront errors of <1.3 nm and a contrast of >10-7 over a substantial region using a shaped pupil. Current work includes the installation and characterization of a 1024-actuator Micro-Electro-Mechanical-Systems (MEMS) deformable mirror, manufactured by Boston Micro-Machines, which will be used for wavefront control. In our initial experiments we can flatten the deformable mirror to 1.8-nm RMS wavefront error within a control radius of 5-13 cycles per aperture. Ultimately this testbed will be used to test all aspects of the system architecture for an extrasolar planet-finding AO system.

Paper Details

Date Published: 25 October 2004
PDF: 6 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551762
Show Author Affiliations
Julia Wilhelmsen Evans, Lawrence Livermore National Lab. (United States)
Univ. of California/Davis (United States)
Gary Sommargren, Lawrence Livermore National Lab. (United States)
Lisa Poyneer, Lawrence Livermore National Lab. (United States)
Bruce A. Macintosh, Lawrence Livermore National Lab. (United States)
Univ. of California/Santa Cruz (United States)
Scott Severson, Univ. of California/Santa Cruz (United States)
Daren Dillon, Univ. of California/Santa Cruz (United States)
Andrew I. Sheinis, Univ. of California/Santa Cruz (United States)
Dave Palmer, Lawrence Livermore National Lab. (United States)
Univ. of California/Santa Cruz (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)
Scot Olivier, 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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