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.
© 2005 Optical Society of America
Qiang Yang, Christ Ftaclas, Mark Chun, and Douglas Toomey, "Hysteresis correction in the curvature adaptive optics system," J. Opt. Soc. Am. A 22, 142-147 (2005)