Linearization of the response of a 91-actuator magnetic liquid deformable mirror
arXiv:1006.2843 · doi:10.1364/OE.18.008239
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 μm having RMS residuals of λ/10 at 632.8 nm. Linear combination of Zernikes and over-time repeatability are also demonstrated.
published in Optics Express 2010. Vol. 18, Iss. 8, 8239-8250