Optical characterization of a bimorph deformable mirror

Abstract

This paper reports the results of interferometric characterization of a bimorph deformable mirror designed for use in an adaptive optics system. The natural frequencies of this DM were measured up to 20 kHz using both a custom stroboscopic phase-shifting interferometer as well as a commercial Laser Doppler Vibrometer. Interferometric measurements of the DM surface profile were analyzed by fitting the surface with mode-shapes predicted using classical plate theory for an elastically-supported disk. The measured natural frequencies were found to be in good agreement with the predictions of the theoretical model. Copyright © 2005 by ASME.

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Christina Chuang
Nanyang Technological University, Singapore
James Werner
University of Washington

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