18 May 2006 Segmented MEMS deformable-mirror technology for space applications
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This paper presents MEMS deformable-mirror technology under development at Iris AO. The hybrid approach uses surface-micromachining techniques to fabricate actuator arrays. High-fill-factor mirror arrays are flip-chip bonded on top of these actuator arrays. The single-crystal-silicon mirror segments provide robust substrates for optical coating with excellent surface quality (6-20 nm rms surface-figure errors). The hexagonally close-packed segments are 350 μm on a side, and can thus provide high-spatial frequency corrections in a small form factor. High-stroke actuation of greater than >7.5 μm has been experimentally verified while keeping actuation voltages within reasonable bounds (<130 V). Three electrodes under each actuator allow for piston/tip/tilt motion. An open-loop controller has been demonstrated to position a 37-segment array resulting in a flattened array with only 19 nm rms of surface figure error.
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Michael A. Helmbrecht, Michael A. Helmbrecht, Thor Juneau, Thor Juneau, Matthew Hart, Matthew Hart, Nathan Doble, Nathan Doble, "Segmented MEMS deformable-mirror technology for space applications", Proc. SPIE 6223, Micro (MEMS) and Nanotechnologies for Space Applications, 622305 (18 May 2006); doi: 10.1117/12.666353; https://doi.org/10.1117/12.666353


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