Simulations of high-order curvature adaptive optics

Details Simulations of high-order curvature adaptive optics Simulations of high-order curvature adaptive optics

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4860..334l&link_type=abstract

High-Contrast Imaging for Exo-Planet Detection. Edited by Alfred B. Schultz. Proceedings of the SPIE, Volume 4860, pp. 334-342

Physics

Optics

Scientific paper

CFHT recently considered an upgrade of its curvature adaptive optics system to perform high dynamic range imaging. This requires high Strehl ratios and very stable PSF, which is usually achieved with high order AO systems providing a dense sampling and correction across the pupil. Such systems are conventionally thought of as Shack-Hartman/piezostack devices because, in theory the scalign law for noise propagation goes as N.log(N) where N is the number of actuators. However, it is difficult to demonstrate this behavior in practice, and as systems get more compelx, their efficiency drops to lower levels than expected. Simulations of such systems are usually optimistic because they fail to take the complexity of a real system's flaws into account.

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