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

Andrew Norton; Don Gavel; Renate Kupke; Marc Reinig; Srikar Srinath; Daren Dillon

doi:10.1117/12.2000666

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5 March 2013 Performance assessment of a candidate architecture for real-time woofer-tweeter controllers: simulation and experimental results

Andrew Norton, Don Gavel, Renate Kupke, Marc Reinig, Srikar Srinath, Daren Dillon

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Proceedings Volume 8617, MEMS Adaptive Optics VII; 86170A (2013) https://doi.org/10.1117/12.2000666
Event: SPIE MOEMS-MEMS, 2013, San Francisco, California, United States

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.

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Andrew Norton, Don Gavel, Renate Kupke, Marc Reinig, Srikar Srinath, and Daren Dillon "Performance assessment of a candidate architecture for real-time woofer-tweeter controllers: simulation and experimental results", Proc. SPIE 8617, MEMS Adaptive Optics VII, 86170A (5 March 2013); https://doi.org/10.1117/12.2000666

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