High Contrast Adaptive Optics for Exoplanet Detections: Performance limits and optimal wavefront sensing strategy

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effects of photon noise, aliasing, wavefront chromaticity and scintillation on the PSF contrast achievable by ground-based adaptive optics (AO) are evaluated for different wavefront sensing schemes. I show that "classical" AO (sensing in the visible, imaging in the near-IR) is limited to about 105 PSF contrast in the central arcsecond because of scintillation chromaticity. This comparative study shows that a focal-plane based wavefront sensor (WFS), combining wavefront sensing and scientific imaging on the same detector is optimal for high contrast imaging. This approach combines high WFS sensitivity, immunity to aliasing and non common path errors and optical design simplicity. Its theoretical performance is compared to commonly used WFSs, illustrating the advantages of this technique. I show that such a system can be efficiently used as a second stage after a low-order AO system. Control and data reduction algorithms are presented, as well as possible optical designs incorporating a coronagraph. A laboratory demonstration of this technique is currently being done at Subaru Telescope.

Original languageEnglish (US)
Pages (from-to)559-564
Number of pages6
JournalProceedings of the International Astronomical Union
Volume1
DOIs
StatePublished - 2005
Externally publishedYes

Fingerprint

planet detection
adaptive optics
sensor
scintillation
immunity
comparative study
coronagraphs
sensors
data reduction
telescopes
sensitivity
detectors
photons
detection
detector
laboratory
effect

Keywords

  • Adaptive optics
  • Speckle
  • Wavefront sensor

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

@article{bd1c4d1104274f6c908ff14c0edee3f7,
title = "High Contrast Adaptive Optics for Exoplanet Detections: Performance limits and optimal wavefront sensing strategy",
abstract = "The effects of photon noise, aliasing, wavefront chromaticity and scintillation on the PSF contrast achievable by ground-based adaptive optics (AO) are evaluated for different wavefront sensing schemes. I show that {"}classical{"} AO (sensing in the visible, imaging in the near-IR) is limited to about 105 PSF contrast in the central arcsecond because of scintillation chromaticity. This comparative study shows that a focal-plane based wavefront sensor (WFS), combining wavefront sensing and scientific imaging on the same detector is optimal for high contrast imaging. This approach combines high WFS sensitivity, immunity to aliasing and non common path errors and optical design simplicity. Its theoretical performance is compared to commonly used WFSs, illustrating the advantages of this technique. I show that such a system can be efficiently used as a second stage after a low-order AO system. Control and data reduction algorithms are presented, as well as possible optical designs incorporating a coronagraph. A laboratory demonstration of this technique is currently being done at Subaru Telescope.",
keywords = "Adaptive optics, Speckle, Wavefront sensor",
author = "Olivier Guyon",
year = "2005",
doi = "10.1017/S1743921306009951",
language = "English (US)",
volume = "1",
pages = "559--564",
journal = "Proceedings of the International Astronomical Union",
issn = "1743-9213",
publisher = "Cambridge University Press",

}

TY - JOUR

T1 - High Contrast Adaptive Optics for Exoplanet Detections

T2 - Performance limits and optimal wavefront sensing strategy

AU - Guyon, Olivier

PY - 2005

Y1 - 2005

N2 - The effects of photon noise, aliasing, wavefront chromaticity and scintillation on the PSF contrast achievable by ground-based adaptive optics (AO) are evaluated for different wavefront sensing schemes. I show that "classical" AO (sensing in the visible, imaging in the near-IR) is limited to about 105 PSF contrast in the central arcsecond because of scintillation chromaticity. This comparative study shows that a focal-plane based wavefront sensor (WFS), combining wavefront sensing and scientific imaging on the same detector is optimal for high contrast imaging. This approach combines high WFS sensitivity, immunity to aliasing and non common path errors and optical design simplicity. Its theoretical performance is compared to commonly used WFSs, illustrating the advantages of this technique. I show that such a system can be efficiently used as a second stage after a low-order AO system. Control and data reduction algorithms are presented, as well as possible optical designs incorporating a coronagraph. A laboratory demonstration of this technique is currently being done at Subaru Telescope.

AB - The effects of photon noise, aliasing, wavefront chromaticity and scintillation on the PSF contrast achievable by ground-based adaptive optics (AO) are evaluated for different wavefront sensing schemes. I show that "classical" AO (sensing in the visible, imaging in the near-IR) is limited to about 105 PSF contrast in the central arcsecond because of scintillation chromaticity. This comparative study shows that a focal-plane based wavefront sensor (WFS), combining wavefront sensing and scientific imaging on the same detector is optimal for high contrast imaging. This approach combines high WFS sensitivity, immunity to aliasing and non common path errors and optical design simplicity. Its theoretical performance is compared to commonly used WFSs, illustrating the advantages of this technique. I show that such a system can be efficiently used as a second stage after a low-order AO system. Control and data reduction algorithms are presented, as well as possible optical designs incorporating a coronagraph. A laboratory demonstration of this technique is currently being done at Subaru Telescope.

KW - Adaptive optics

KW - Speckle

KW - Wavefront sensor

UR - http://www.scopus.com/inward/record.url?scp=63549121727&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=63549121727&partnerID=8YFLogxK

U2 - 10.1017/S1743921306009951

DO - 10.1017/S1743921306009951

M3 - Article

AN - SCOPUS:63549121727

VL - 1

SP - 559

EP - 564

JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

SN - 1743-9213

ER -