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We have built 1 mm circular and 1 mm × 1.4 mm elliptical surface micro-machined SU-8 2002 deformable mirrors for
focus control. The SU-8 2002 membrane layers are 2.25 μm thick with gold as the reflective coating on their surfaces.
Three annular electrodes were used for electrostatic actuation. Stable deflection was observed up to 6.8 μm for a 1 mm ×
1.4 mm elliptical mirror with an air gap of 14 μm. The frequency response of the membrane exhibited a 3 dB frequency
larger than 10 kHz.
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Sarah J. Lukes, David Lämmle, David L. Dickensheets, "Surface micro-machined SU-8 2002 membrane mirrors for focus control," Proc. SPIE 7594, MOEMS and Miniaturized Systems IX, 75940E (16 February 2010); https://doi.org/10.1117/12.844292