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Journal of Astronomical Telescopes, Instruments, and Systems • Open Access

Methods and limitations of focal plane sensing, estimation, and control in high-contrast imaging

Paper Abstract

Coronagraphy is a very promising method for directly imaging exoplanets, but the performance of a coronagraph is highly sensitive to quasi-static aberrations within the telescope. The resultant speckles are suppressed in the final focal plane using a wavefront control system that estimates the field at the final focal plane to avoid any noncommon path error. This requires a set of probe images that modulate the field so that it may be estimated. With an estimate of the focal plane electric field, a control law is defined to suppress the speckle field so that the planet can be imaged. Characterizing the planet requires that the speckle field be suppressed simultaneously over the bandpass of interest. The choice of control law, bandpass, estimator, and probing methodology has implications in the control solutions and contrast performance. Here, we compare wavefront probing, estimation, and control algorithms, and describe their practical implementation.

Paper Details

Date Published: 17 December 2015
PDF: 15 pages
J. Ast. Inst. Sys. 2(1) 011009 doi: 10.1117/1.JATIS.2.1.011009
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 2, Issue 1
Show Author Affiliations
Tyler D. Groff, Princeton Univ. (United States)
A. J. Eldorado Riggs, Princeton Univ. (United States)
Brian Kern, Jet Propulsion Lab. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)

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