Deformable mirror with dither

摘要

A multi-actuator deformable mirror and control system which comprises a copper-surfaced, aluminum faceplate supported by a flexure strut attached to an aluminum-backed structure and actuated by nineteen differential ball screw mirror actuator assemblies. The actuators are driven directly by direct current stepping motors capable of 400 steps/rev when operating in "half step" mode. A 10 mu meter per revolution differential pitch in the screw provides a resolution of 1 mu inch per motor step. An alternating current dither actuator comprising a plurality of piezo-ceramic elements is connected one each in series with said actuator assemblies for providing both tagging and real time dynamic corrections.