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Closed-loop Wavefront Correction for High Contrast Imaging: The “peak-a-boo” Algorithm

Published online by Cambridge University Press:  02 May 2006

Amir Give'on ,
N. Jeremy Kasdin  and
Robert J. Vanderbei
Amir Give'on
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544 Michelson graduate fellow, Michelson Science Center, California Institute of Technology, 770 S Wilson Avenue, MS 100-22, Pasadena, CA 91125
N. Jeremy Kasdin
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
Robert J. Vanderbei
Affiliation:
Department of Operational Research and Financial Engineering, Princeton University, Princeton, NJ 08544
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Abstract

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High contrast imaging from space must overcome photon noise of the diffracted star light and scattered light from optical components defects. The very high contrast required (up to $10^{-10}$ for terrestrial planets) puts severe requirements on the wavefront control system, as the achievable contrast is limited by the quality of the wavefront. In this paper we present a closed loop correction method for the shaped pupil coronagraph to minimize the energy in a pre-defined region in the image where terrestrial planets would be found. The reconstruction part uses three intensity measurements in the image plane with a pinhole added to the shaped pupil for diversity. This method has been shown in simulations to be effective in the presence of photon noise, deformable mirror modeling errors and overcoming defective actuators in the deformable mirror.

Keywords

instrumentation: adaptive optics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C200: Direct Imaging of Exoplanets: Science & Techniques , October 2005 , pp. 541 - 546
Copyright
© 2006 International Astronomical Union