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 microm having RMS residuals of lambda/10 at 632.8 nm. Linear combination of Zernikes and over-time repeatability are also demonstrated.
Brousseau
Denis
D
Département de physique, de génie physique et d'optique and Centre d'optique, photonique et laser (COPL), Université Laval, 2375 rue de la Terrasse, Québec, Québec,G1V 0A6 Canada. denis.brousseau@copl.ulaval.ca
Borra
Ermanno F
EF
Rochette
Maxime
M
Landry
Daniel Bouffard
DB