Abstract
We describe a simple and efficient implementa- tion of adaptive multiplexing control for high-order piezoelec- tric deformable mirrors. The relatively high capacitance of piezoelectric actuators allows the electrical charge to be stored in a disconnected actuator, retaining its displacement while the other actuators can be addressed. Adaptive multi- plexing, consisting of selective addressing of only those ac- tuators that need to change their elongation in the current cycle, improves the mirror performance and simplifies the driver electronics. In experiment, a 12-channel prototype of a deformable mirror with multiplexing control has been charac- terized. At appropriate update rates with a fixed set of control signals, the shape of the deformable mirror remains nearly constant. A surface displacement error does not exceed /100 rms at a multiplexing frequency of 700 Hz with a
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