Advancement of Piezo-Stack DM technology at CILAS: Example of HODM for KIS Gregor Solar Telescope


J.C. Sinquin, A. Bastard, R. Cousty, C. Guillemard, H. Pagès


Cilas – 8, avenue Buffon, Z.I. La Source, 45063 Orléans


Cilas has designed, manufactured and tested the deformable mirror for use in the high order adaptive optics system in the 1.5 m Gregor solar telescope (Tenerife). In the scope of this project for Kiepenheuer-Institut für Sonnenphysik (KIS), we have reached the smallest spacing ever made with our piezo-stack technology (3.2 mm) while increasing the overall reliability of our DMs by significant design evolutions. We will present the main specifications of the DM (18x18 actuator array, > 2 μm interactuator stroke, > 20 kHz main resonance frequency) and the study results on reliability. This study is focused on electrical and opto-mechanical stability of the DM vs. time. The improved piezo-stack technology will be used for next generation of DMs for large telescopes as TMT and ESO (VLT and E-ELT)

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