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17 December 2015 Methods and limitations of focal plane sensing, estimation, and control in high-contrast imaging
Tyler D. Groff, A. J. Eldorado Riggs, Brian Kern, N. Jeremy Kasdin
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Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 2, Issue 1, 011009 (December 2015). https://doi.org/10.1117/1.JATIS.2.1.011009
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.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Tyler D. Groff, A. J. Eldorado Riggs, Brian Kern, and N. Jeremy Kasdin "Methods and limitations of focal plane sensing, estimation, and control in high-contrast imaging," Journal of Astronomical Telescopes, Instruments, and Systems 2(1), 011009 (17 December 2015). https://doi.org/10.1117/1.JATIS.2.1.011009
Published: 17 December 2015
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Cited by 62 scholarly publications.
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KEYWORDS
Imaging systems
Control systems
Wavefronts
Error analysis
Coronagraphy
Speckle
Sensing systems
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