Real-time estimation and correction of quasi-static aberrations in ground-based high contrast imaging systems with high frame-rates

Alexander T. Rodack, Jared R. Males, Olivier Guyon, Benjamin A. Mazin, Michael P. Fitzgerald, Dimitri Mawet

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The success of ground-based, high contrast imaging for the detection of exoplanets in part depends on the ability to differentiate between quasi-static speckles caused by aberrations not corrected by adaptive optics (AO) systems, known as non-common path aberrations (NCPAs), and the planet intensity signal. Frazin (ApJ, 2013) introduced a post-processing algorithm demonstrating that simultaneous millisecond exposures in the science camera and wavefront sensor (WFS) can be used with a statistical inference procedure to determine both the series expanded NCPA coefficients and the planetary signal. We demonstrate, via simulation, that using this algorithm in a closed-loop AO system, real-time estimation and correction of the quasi-static NCPA is possible without separate deformable mirror (DM) probes. Thus the use of this technique allows for the removal of the quasi-static speckles that can be mistaken for planetary signals without the need for new optical hardware, improving the efficiency of ground-based exoplanet detection. In our simulations, we explore the behavior of the Frazin Algorithm (FA) and the dependence of its convergence to an accurate estimate on factors such as Strehl ratio, NCPA strength, and number of algorithm search basis functions. We then apply this knowledge to simulate running the algorithm in real-time in a nearly ideal setting. We then discuss adaptations that can be made to the algorithm to improve its real-time performance, and show their efficacy in simulation. A final simulation tests the technique's resilience against imperfect knowledge of the AO residual phase, motivating an analysis of the feasibility of using this technique in a real closed-loop Extreme AO system such as SCExAO or MagAO-X, in terms of computational complexity and the accuracy of the estimated quasi-static NCPA correction.

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems VI
EditorsDirk Schmidt, Laura Schreiber, Laird M. Close
PublisherSPIE
Volume10703
ISBN (Print)9781510619593
DOIs
StatePublished - Jan 1 2018
EventAdaptive Optics Systems VI 2018 - Austin, United States
Duration: Jun 10 2018Jun 15 2018

Other

OtherAdaptive Optics Systems VI 2018
CountryUnited States
CityAustin
Period6/10/186/15/18

Fingerprint

High Contrast Imaging
Aberrations
Aberration
Imaging System
Imaging systems
aberration
Adaptive optics
Real-time
adaptive optics
Adaptive Optics
Path
Exoplanets
Speckle
Closed-loop
Simulation
Extreme Adaptive Optics
Aberration Correction
simulation
Wavefront Sensor
Deformable Mirror

Keywords

  • Active speckle control
  • Exoplanets
  • Extreme adaptive optics
  • High contrast imaging
  • Quasi-static speckles

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Rodack, A. T., Males, J. R., Guyon, O., Mazin, B. A., Fitzgerald, M. P., & Mawet, D. (2018). Real-time estimation and correction of quasi-static aberrations in ground-based high contrast imaging systems with high frame-rates. In D. Schmidt, L. Schreiber, & L. M. Close (Eds.), Adaptive Optics Systems VI (Vol. 10703). [107032N] SPIE. https://doi.org/10.1117/12.2312218

Real-time estimation and correction of quasi-static aberrations in ground-based high contrast imaging systems with high frame-rates. / Rodack, Alexander T.; Males, Jared R.; Guyon, Olivier; Mazin, Benjamin A.; Fitzgerald, Michael P.; Mawet, Dimitri.

Adaptive Optics Systems VI. ed. / Dirk Schmidt; Laura Schreiber; Laird M. Close. Vol. 10703 SPIE, 2018. 107032N.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Rodack, AT, Males, JR, Guyon, O, Mazin, BA, Fitzgerald, MP & Mawet, D 2018, Real-time estimation and correction of quasi-static aberrations in ground-based high contrast imaging systems with high frame-rates. in D Schmidt, L Schreiber & LM Close (eds), Adaptive Optics Systems VI. vol. 10703, 107032N, SPIE, Adaptive Optics Systems VI 2018, Austin, United States, 6/10/18. https://doi.org/10.1117/12.2312218
Rodack AT, Males JR, Guyon O, Mazin BA, Fitzgerald MP, Mawet D. Real-time estimation and correction of quasi-static aberrations in ground-based high contrast imaging systems with high frame-rates. In Schmidt D, Schreiber L, Close LM, editors, Adaptive Optics Systems VI. Vol. 10703. SPIE. 2018. 107032N https://doi.org/10.1117/12.2312218
Rodack, Alexander T. ; Males, Jared R. ; Guyon, Olivier ; Mazin, Benjamin A. ; Fitzgerald, Michael P. ; Mawet, Dimitri. / Real-time estimation and correction of quasi-static aberrations in ground-based high contrast imaging systems with high frame-rates. Adaptive Optics Systems VI. editor / Dirk Schmidt ; Laura Schreiber ; Laird M. Close. Vol. 10703 SPIE, 2018.
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