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Proceedings Paper

High-contrast coronagraph performance in the presence of DM actuator defects
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Paper Abstract

Deformable Mirrors (DMs) are critical elements in high contrast coronagraphs, requiring precision and stability measured in picometers to enable detection of Earth-like exoplanets. Occasionally DM actuators or their associated cables or electronics fail, requiring a wavefront control algorithm to compensate for actuators that may be displaced from their neighbors by hundreds of nanometers. We have carried out experiments on our High-Contrast Imaging Testbed (HCIT) to study the impact of failed actuators in partial fulfilment of the Terrestrial Planet Finder Coronagraph optical model validation milestone. We show that the wavefront control algorithm adapts to several broken actuators and maintains dark-hole contrast in broadband light.

Paper Details

Date Published: 16 September 2015
PDF: 11 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96051Y (16 September 2015); doi: 10.1117/12.2188183
Show Author Affiliations
Erkin Sidick, Jet Propulsion Lab. (United States)
Stuart Shaklan, Jet Propulsion Lab. (United States)
Eric Cady, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 9605:
Techniques and Instrumentation for Detection of Exoplanets VII
Stuart Shaklan, Editor(s)

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