title: Hysteresis correction in the curvature adaptive optics system.
abstract: An enhancing Coleman-Hodgdon model is introduced to describe the hysteresis curves of the bimorph deformable mirror (DM). Hysteresis curves are measured from a bimorph DM and then experiment is set up for the correction of hysteresis. Finally, step response and transfer functions of a curvature adaptive optics (AO) system are compared in three cases: with DM hysteresis, without hysteresis, and with hysteresis but corrected. Simulation results show that the bandwidth of a curvature AO system is improved significantly under different loop gains after hysteresis of the DM is corrected.
authors.affiliation: Department of Mathematical Sciences, Montana State University, Bozeman, Montana 59717, USA. yang@math.montana.edu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yang
authors.forename: Christ
authors.initials: C
authors.lastname: Ftaclas
authors.forename: Mark
authors.initials: M
authors.lastname: Chun
authors.forename: Douglas
authors.initials: D
authors.lastname: Toomey