NASA NTRS · 20110013185
Path Length Control in a Nulling Coronagraph with a MEMS Deformable Mirror and a Calibration Interferometer
Abstract
We report progress on a nulling coronagraph intended for direct imaging of extrasolar planets. White light is suppressed in an interferometer, and phase errors are measured by a second interferometer. A 1020-pixel MEMS deformable mirror in the first interferometer adjusts the path length across the pupil. A feedback control system reduces deflections of the deformable mirror to order of 1 nm rms.
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Rao, Shanti R., Wallacea, J. Kent, Samuele, Rocco, Chakrabarti, Supriya, Cook, Timothy, Hicks, Brian, Jung, Paul, Lane, Benjamin, Levine, B. Martin, Mendillo, Chris, Schmidtlin, Edouard, Shao, Mike, Stewart, Jason B.. 2008-01-23. Path Length Control in a Nulling Coronagraph with a MEMS Deformable Mirror and a Calibration Interferometer. https://ntrs.nasa.gov/citations/20110013185
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