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High-Contrast Coronagraph Performance in the Presence of DM Actuator DefectsDeformable 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 fulfillment 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.
Document ID
20170007039
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Sidick, Erkin
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Shaklan, Stuart
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Cady, Eric
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 1, 2017
Publication Date
August 9, 2015
Subject Category
Optics
Meeting Information
Meeting: SPIE Optics + Photonics 2015
Location: San Diego, CA
Country: United States
Start Date: August 9, 2015
End Date: August 13, 2015
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
adaptive optics
exoplanets
high-contrast imaging
space telescopes

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