Recent improvements of high density magnetic deformable mirrors: faster, larger and stronger

Julien Charton; Urban Bitenc; Jean-Francois Curis; Sebastien Camet; Romain Di Chiaro; Rozenn Bougeard

doi:10.1117/12.2055872

7 August 2014 Recent improvements of high density magnetic deformable mirrors: faster, larger and stronger

Julien Charton, Urban Bitenc, Jean-Francois Curis, Sebastien Camet, Romain Di Chiaro, Rozenn Bougeard

Proceedings Volume 9148, Adaptive Optics Systems IV; 914825 (2014) https://doi.org/10.1117/12.2055872
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The performances of high resolution magnetic deformable mirrors have been recently improved: the mechanical bandwidth has been increased to 2 kHz, and a fast stroboscopic Shack-Harman wavefront was used to measure a settling time as low as 400μs. Recent improvements in the substrate-thinning processes made possible the availability of large, high-quality membranes compatible with deformable mirrors. Prototype testing and simulations show that devices with up to 60x60 actuators are now possible. For open-loop operations, a novel feed-forward algorithm was developed to compensate for residual creeping and improve the DM stability to below10nm RMS over 6 hours.

Citation Download Citation

Julien Charton, Urban Bitenc, Jean-Francois Curis, Sebastien Camet, Romain Di Chiaro, and Rozenn Bougeard "Recent improvements of high density magnetic deformable mirrors: faster, larger and stronger", Proc. SPIE 9148, Adaptive Optics Systems IV, 914825 (7 August 2014); https://doi.org/10.1117/12.2055872

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