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We present the experimental performance of a 91-actuator deformable mirrormade of a magnetic liquid (ferrofluid) using a new technique that linearizesthe response of the mirror by superposing a uniform magnetic field to the oneproduced by the actuators. We demonstrate linear driving of the mirror usinginfluence functions, measured with a Fizeau interferometer, by producing thefirst 36 Zernikes polynomials. Based on our measurements, we predict achievablemean 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-timerepeatability are also demonstrated.

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