Abstract

We describe a solution to increase the performance of a pyramid wavefront sensor (P-WFS) under bad seeing conditions. We show that most of the issues involve a reduced sensitivity that depends on the magnitude of the high frequency atmospheric distortions. We demonstrate in end-to-end closed loop adaptive optics simulations that with a modal sensitivity compensation method a high-order system with a nonmodulated P-WFS is robust in conditions with the Fried parameter r0 at 0.5μm in the range of 0.050.10  m. We also show that the method makes it possible to use a modal predictive control system to reach a total performance improvement of 0.060.45 in Strehl ratio at 1.6μm. Especially at r0=0.05  m the gain is dramatic.

© 2008 Optical Society of America

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