@inproceedings{5e75441e478d4cb8aeb03c9f7eea9de7,
title = "Design of the deformable mirror demonstration CubeSat (DeMi)",
abstract = "The Deformable Mirror Demonstration Mission (DeMi) was recently selected by DARPA to demonstrate in-space operation of a wavefront sensor and Microelectromechanical system (MEMS) deformable mirror (DM) payload on a 6U CubeSat. Space telescopes designed to make high-contrast observations using internal coronagraphs for direct characterization of exoplanets require the use of high-actuator density deformable mirrors. These DMs can correct image plane aberrations and speckles caused by imperfections, thermal distortions, and diffraction in the telescope and optics that would otherwise corrupt the wavefront and allow leaking starlight to contaminate coronagraphic images. DeMi is provide on-orbit demonstration and performance characterization of a MEMS deformable mirror and closed loop wavefront sensing. The DeMi payload has two operational modes, one mode that images an internal light source and another mode which uses an external aperture to images stars. Both the internal and external modes include image plane and pupil plane wavefront sensing. The objectives of the internal measurement of the 140-actuator MEMS DM actuator displacement are characterization of the mirror performance and demonstration of closed-loop correction of aberrations in the optical path. Using the external aperture to observe stars of magnitude 2 or brighter, assuming 3-axis stability with less than 0.1 degree of attitude knowledge and jitter below 10 arcsec RMSE, per observation, DeMi will also demonstrate closed loop wavefront control on an astrophysical target. We present an updated payload design, results from simulations and laboratory optical prototyping, as well as present our design for accommodating high-voltage multichannel drive electronics for the DM on a CubeSat.",
keywords = "MEMS, deformable mirrors, exoplanets, high-contrast imaging, transits, wavefront sensing",
author = "Douglas, {Ewan S.} and Gregory Allan and Derek Barnes and Figura, {Joseph S.} and Haughwout, {Christian A.} and Gubner, {Jennifer N.} and Knoedler, {Alex A.} and Sarah Leclair and Murphy, {Thomas J.} and Nikolaos Skouloudis and John Merck and Opperman, {Roedolph A.} and Cahoy, {Kerri L.}",
note = "Funding Information: This work has been sponsored by DARPA funding under a contract with Aurora Flight Sciences, Cambridge, MA, USA. Funding Information: The authors would like to thank Anne Marinan of the Jet Propulsion Laboratory for support of this project and Eduardo Bendek and Ruslan Belikov, both of NASA Ames Research Center, for helpful discussions. Thanks also to John Taranto of Thorlabs, Inc., Jared Males of the University of Arizona, Jason Stewart of MIT Lincoln Laboratory, and Paul Bierden and Michael Feinberg of Boston Micromachines. A.A.K., J.N.G., and T.J.M. participated under the auspices of the Massachusetts Institute of Technology Undergraduate Research Opportunities Program. This work has been sponsored by DARPA funding under a contract with Aurora Flight Sciences, Cambridge, MA, USA. Publisher Copyright: {\textcopyright} 2017 COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Techniques and Instrumentation for Detection of Exoplanets VIII 2017 ; Conference date: 08-08-2017 Through 10-08-2017",
year = "2017",
doi = "10.1117/12.2274430",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Stuart Shaklan",
booktitle = "Techniques and Instrumentation for Detection of Exoplanets VIII",
}