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Proceedings Paper

Performance assessment of a candidate architecture for real-time woofer-tweeter controllers: simulation and experimental results
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Paper Abstract

We evaluate the performance of a woofer-tweeter controller architecture for the new 3-meter Shane Telescope (Lick Observatory) laser guidestar adaptive optics (AO) system. Low order, high stroke phase correction is performed using the normal modal basis set of the Alpao woofer deformable mirror (DM). Since the woofer and tweeter DMs share the same wavefront sensor, the projected woofer phase correction is offloaded from the high-order, low stroke phase aberrations corrected by the tweeter DM. This ensures the deformable mirrors complementarily correct the input phase disturbance and minimizes likelihood of the tweeter actuators saturating. Preliminary analysis of on-sky closed-loop deformable mirror telemetry data from currently operating AO systems at Mt. Hamilton, as well as statistically accurate Kolmogorov phase screens, indicate that correction of up to 34 woofer modes results in all tweeter actuators remaining within their stroke limit.

Paper Details

Date Published: 5 March 2013
PDF: 14 pages
Proc. SPIE 8617, MEMS Adaptive Optics VII, 86170A (5 March 2013); doi: 10.1117/12.2000666
Show Author Affiliations
Andrew Norton, Univ. of California, Santa Cruz (United States)
Don Gavel, Univ. of California, Santa Cruz (United States)
Renate Kupke, Univ. of California, Santa Cruz (United States)
Marc Reinig, Univ. of California, Santa Cruz (United States)
Srikar Srinath, Univ. of California, Santa Cruz (United States)
Daren Dillon, Univ. of California, Santa Cruz (United States)

Published in SPIE Proceedings Vol. 8617:
MEMS Adaptive Optics VII
Scot S. Olivier; Thomas G. Bifano; Joel Kubby, Editor(s)

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