Extracting hysteresis from nonlinear measurement of wavefront-sensorless adaptive optics system

Journal article (2008)
Department
Delft Center for Systems and Control (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2008 Optical Society of America
DOI: https://doi.org/doi:10.1364/OL.34.000061
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Published Date

24-12-2008

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Source:

Optics Letters, 34 (1) 2009

Faculty

Mechanical, Maritime and Materials Engineering

Department

Delft Center for Systems and Control

Abstract

In many scientific and medical applications wavefront-sensorless adaptive optics (AO) systems are used to correct the wavefront aberration by optimizing a certain target parameter, which is nonlinear with respect to the control signal to the deformable mirror (DM). Hysteresis is the most common nonlinearity of DMs, which can be corrected if the information about the hysteresis behavior is present. We report a general approach to extract hysteresis from the nonlinear behavior of the adaptive optical system, with the illustration of a Foucault knife test, where the voltage–intensity relationship consists of both hysteresis and some memoryless nonlinearity. The hysteresis extracted here can be used for modeling and linearization of the AO system.

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