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.
@article{arxiv.1006.2843,
title = {Linearization of the response of a 91-actuator magnetic liquid deformable mirror},
author = {Denis Brousseau and Ermanno F. Borra and Maxime Rochette and Daniel Bouffard Landry},
journal= {arXiv preprint arXiv:1006.2843},
year = {2011}
}
Comments
published in Optics Express 2010. Vol. 18, Iss. 8, 8239-8250