Distributed modal command for a two-deformable-mirror adaptive optics system.
The design of future single-altitude conjugated adaptive optics (AO) systems may include at least two deformable mirrors (DMs) instead of one as in the current AO system. Each DM will have to correct for a specific spatial frequency range. A method is presented to derive a DM modal basis based on the influence functions of the DM. The modal bases are derived such that they are orthogonal to a given set of modes that restrict the DM correction to a spatial frequency domain. The modal bases have been tested on the woofer-tweeter test bench at the University of Victoria. It has been shown that the rms amplitude of the woofer DM and tweeter DM stroke can be reduced by factors of 3 and 9, respectively, when making the transition from a zonal-driven closed loop to a modal-driven closed loop with the same performance in both cases.
Conan
R
R
University of Victoria, Engineering Lab Wing A212, P.O. Box 3055 STN CSC, Victoria, British Columbia, Canada, V8W 3P6. rconan@uvic.ca
Bradley
C
C
Hampton
P
P
Keskin
O
O
Hilton
A
A
Blain
C
C