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arXiv · 1006.2843

Linearization of the response of a 91-actuator magnetic liquid deformable mirror

Denis Brousseau·Ermanno F. Borra·Maxime Rochette·Daniel Bouffard Landry
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Abstract

We present the experimental performance of a 91-actuator deformable mirror made of a magnetic liquid (ferrofluid) using a new technique that linearizes the response of the mirror by superposing a uniform magnetic field to the one produced by the actuators. We demonstrate linear driving of the mirror using influence functions, measured with a Fizeau interferometer, by producing the first 36 Zernikes polynomials. Based on our measurements, we predict achievable mean PV wavefront amplitudes of up to 30 {\mu}m having RMS residuals of {\lambda}/10 at 632.8 nm. Linear combination of Zernikes and over-time repeatability are also demonstrated.

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Denis Brousseau, Ermanno F. Borra, Maxime Rochette, Daniel Bouffard Landry. 2010-06-14. Linearization of the response of a 91-actuator magnetic liquid deformable mirror. https://doi.org/10.1364/oe.18.008239

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