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Proceedings Article

Extreme wave front sensing accuracy for the Eclipse coronagraphic space telescope

[+] Author Affiliations
Joseph J. Green, David C. Redding, Stuart B. Shaklan, Scott A. Basinger

Jet Propulsion Lab. (USA)

Proc. SPIE 4860, High-Contrast Imaging for Exo-Planet Detection, 266 (February 25, 2003); doi:10.1117/12.457883
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From Conference Volume 4860

  • High-Contrast Imaging for Exo-Planet Detection
  • Alfred B. Schultz; Richard G. Lyon
  • Waikoloa, Hawai'i, USA | August 22, 2002

abstract

The Eclipse coronagraphic telescope will allow for high contrast imaging near a target star to facilitate planet finding. One key element will be its high accuracy, high authority deformable mirror (DM) that controls the wave front error (WFE) down to an acceptable level. In fact, to achieve the desired contrast ratio of nine orders of magnitude (in intensity) to within 0.35 arcseconds of the target star, the WFE in the telescope must be controlled to level below 1Ê rms within the controllable bandwidth of the DM. To achieve this extreme wave front sensing (WFS) accuracy, we employ a focus-diverse phase retrieval method extended from the Next Generation Space Telescope baseline approach. This method processes a collection defocused point-spread functions, measured at the occulting position in the Eclipse optical system, into a high accuracy estimate of the exit-pupil WFE. Through both simulation and hardware experiments, we examine and establish the key data requirements, such as the defocus levels and imaging signal-to noise level, that are necessary to obtain the desired WFS accuracy and bandwidth.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Joseph J. Green ; David C. Redding ; Stuart B. Shaklan and Scott A. Basinger
"Extreme wave front sensing accuracy for the Eclipse coronagraphic space telescope", Proc. SPIE 4860, High-Contrast Imaging for Exo-Planet Detection, 266 (February 25, 2003); doi:10.1117/12.457883; http://dx.doi.org/10.1117/12.457883


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