Fast iterative algorithm (FIA) for controlling MEMS deformable mirrors: Principle and laboratory demonstration

Célia Blain, Olivier Guyon, Colin Bradley, Olivier Lardière

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We present a fast and high accuracy iterative algorithm to control Micro-Electro-Mechanical-System (MEMS) deformable mirrors (DMs) for open-loop (OL) adaptive optics (AO) applications. Our approach relies on a simple physical model for the forces applied on DM actuators and membrane, defined by a small number of parameters that we measure in an experimental setup. The algorithm iteratively applies forces and updates actuator displacements, allowing real-time utilization in an Extreme-AO system (control rate ≥ Khz). Our measurements show that it reproduces Kolmogorov type phase screens with an error equal to 7.3% of the rms of the desired phase (1.6% of the peak-to-valley of the desired phase). This performance corresponds to an improvement of a factor three compared to the standard quadratic model (common relation between voltage and actuator displacement). Originally developed for the DM control of the Subaru Coronagraphic Extreme-AO (SCExAO) project, the algorithm is also suitable for Multi-Object AO systems.

Original languageEnglish (US)
Pages (from-to)21271-21294
Number of pages24
JournalOptics Express
Volume19
Issue number22
DOIs
Publication statusPublished - Oct 24 2011
Externally publishedYes

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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