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

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 μm having RMS residuals of λ/10 at 632.8 nm. Linear combination of Zernikes and over-time repeatability are also demonstrated.

preprint2010arXivOpen access
Denis BrousseauErmanno F. BorraMaxime RochetteDaniel Bouffard Landry
astro-ph.IMphysics.optics
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Denis BrousseauErmanno F. BorraMaxime RochetteDaniel Bouffard Landry

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