5.4 Deformable mirror
The 97 actuator deformable mirror system used is a commercially available unit (Ealey and Wellman,
1994) and has been successfully operated as part of the NSO low order AO system. The continuous
facesheet, stacked actuator mirror has very localized influence functions with only 10% crosstalk between
adjacent actuators. It has been argued that a larger crosstalk may actually be of advantage (Fusco et al.,
2006a,b). The DM system has proven to be very robust.