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HCIT Broadband Contrast Performance Sensitivity StudiesThe High Contrast Imaging Testbed (HCIT) at the Jet Propulsion Laboratory employs a broadband wavefront correction algorithm called Electric Field Conjugation (EFC) to obtain the required 10-10 contrast. This algorithm works with one deformable mirror (DM) to estimate the electric-field to be controlled, and with one or multiple DM's to create a "darkhole" in a predefined region of the image plane where terrestrial planets would be found. We have investigated the effects of absorbing dust particles on a flat optic, absorbing spots on the occulting mask, dead actuators on the DM, and the effects of control bandwidth on the efficiency of the EFC algorithm in a Lyot coronagraph configuration. The structural design of the optical system as well as the parameters of various optical elements used in the analysis is drawn from those of the HCIT system that have been implemented with one DM. The simulation takes into account the surface errors of various optical elements. Results of some of these studies have been verified by actual measurements.
Document ID
20130001784
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)
Balasubramanian, Kunjithapatham
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 27, 2013
Publication Date
August 12, 2012
Subject Category
Electronics And Electrical Engineering
Meeting Information
Meeting: SPIE Optics and Photonics 2012
Location: San Diego, CA
Country: United States
Start Date: August 12, 2012
End Date: August 16, 2012
Sponsors: International Society for Optical Engineering
Distribution Limits
Public
Copyright
Other
Keywords
Coronagraphy
space telescopes
exoplanets
adaptive optics

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