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Kaccie Li, Sandipan Mishra, Austin Roorda; Simulation and experimental demonstration of a linearized adaptive optics control loop. Journal of Vision 2007;7(15):79. doi: 10.1167/7.15.79.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To construct an MEMS-based AO system for testing wavefront reconstruction and control algorithms specific for the human eye and to develop an accurate computer simulation of the system. Methods: Seven static aberration profiles were produced and measured on the real and simulated DMs. The DM used has 141 actuators of which 19 are non-functional. The same characteristics were assigned to the simulated DM (Vogel and Yang, JOSA A 2006). DM responses were linearized by operating the controller (an integrator with anti-windup) in units proportional to voltage-squared. Comparisons were made between the proposed controller and the standard integral controller of most AO systems. Results: Deflection curves for the simulated DM correlate well to those provided by the manufacturer: r2 = 0.996, 0.990 and 0.968 for a single actuator, a single edge actuator and a 3 by 3 block of actuators. A 15 to 40 percent improvement in the root-mean-squared (rms) of the compensated wavefront error was observed for 5 of the 7 eyes. Sub-0.1 um rms was achieved for all eyes that were initially below 0.8 um rms. Conclusions: The simulated and actual DMs showed similar behavior throughout the study. The proposed controller performed better than the standard integrator.
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