Push-pull deformable mirror: characterization and closed loop operations

摘要

In this paper we describe the performances of a "push-pull" deformable mirror (DM) which has the advantage of having a mirror membrane that can be attracted either from the back, as conventional electrostatic mirrors, or from the front. This technology has several advantages such as: doubled maximum deformation, a better accuracy in phase mode reproduction, and bidirectional deformation that allows closed loop operations without biasing. The key idea, when developing this push-pull deformable mirror, was to have a good compromise between performances and practical applicability for series production. An analysis of the constraints/practical limitations is described using simulations and laboratory tests. Following these results, we foresee the benefits of inserting the push-pull DM (Saturn, Adaptica Srl) in practical applications such as ophthalmology and microscopy.