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30 May 2013Large-aperture active optical carbon fiber reinforced polymer mirror
Matthew E. L. Jungwirth,1,2 Christopher C. Wilcox,3 David V. Wick,1 Michael S. Baker,1 Clinton G. Hobart,1 Jared J. Milinazzo,1 Joseph Robichaud,4 Robert C. Romeo,5 Robert N. Martin,5 Jerome Ballesta,6 Emeric Lavergne,7 Eustace L. Dereniak8
1Sandia National Labs. (United States) 2Honeywell ACS (United States) 3U.S. Naval Research Lab. (United States) 4L-3 Communications IOS-SSG (United States) 5Composite Mirror Applications, Inc. (United States) 6Imagine Optic Inc. (United States) 7Imagine Optic SA (France) 8College of Optical Sciences, The Univ. of Arizona (United States)
An active reflective component can change its focal length by physically deforming its reflecting surface. Such elements exist at small apertures, but have yet to be fully realized at larger apertures. This paper presents the design and initial results of a large-aperture active mirror constructed of a composite material called carbon fiber reinforced polymer (CFRP). The active CFRP mirror uses a novel actuation method to change radius of curvature, where actuators press against two annular rings placed on the mirror’s back. This method enables the radius of curvature to increase from 2000mm to 2010mm. Closed-loop control maintains good optical performance of 1.05 waves peak-to-valley (with respect to a HeNe laser) when the active CFRP mirror is used in conjunction with a commercial deformable mirror.
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Matthew E. L. Jungwirth, Christopher C. Wilcox, David V. Wick, Michael S. Baker, Clinton G. Hobart, Jared J. Milinazzo, Joseph Robichaud, Robert C. Romeo, Robert N. Martin, Jerome Ballesta, Emeric Lavergne, Eustace L. Dereniak, "Large-aperture active optical carbon fiber reinforced polymer mirror," Proc. SPIE 8725, Micro- and Nanotechnology Sensors, Systems, and Applications V, 87250W (30 May 2013);