Ground-layer wave front reconstruction from multiple natural guide stars

Christoph Baranec, Michael Lloyd-Hart, N. Mark Milton

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Observational tests of open-loop ground-layer wave front recovery have been made using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona. Such tests explore the effectiveness of wide-field seeing improvement by correction of low-lying atmospheric turbulence with ground-layer adaptive optics (GLAO). The wave fronts from the four stars were measured simultaneously on a Shack-Hartmann wave front sensor (WFS). The WFS placed a 5 × 5 array of square subapertures across the pupil of the telescope, allowing for wave front reconstruction up to the fifth radial Zernike order. We find that the wave front aberration in each star can be roughly halved by subtracting the average of the wave fronts from the other three stars. Wave front correction on this basis leads to a reduction in width of the seeing-limited stellar image by up to a factor of 3, with image sharpening effective from the visible to near-infrared wavelengths over a field of at least 2′. We conclude that GLAO correction will be a valuable tool that can increase resolution and spectrographic throughput across a broad range of seeing-limited observations.

Original languageEnglish (US)
Pages (from-to)1332-1338
Number of pages7
JournalAstrophysical Journal
Volume661
Issue number2 I
DOIs
StatePublished - Jun 1 2007

Fingerprint

wave front reconstruction
wave fronts
stars
adaptive optics
low turbulence
telescopes
sensor
constellations
sensors
atmospheric turbulence
pupils
aberration
recovery
near infrared
turbulence
wavelength

Keywords

  • Atmospheric effects
  • Instrumentation: adaptive optics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Ground-layer wave front reconstruction from multiple natural guide stars. / Baranec, Christoph; Lloyd-Hart, Michael; Milton, N. Mark.

In: Astrophysical Journal, Vol. 661, No. 2 I, 01.06.2007, p. 1332-1338.

Research output: Contribution to journalArticle

Baranec, Christoph ; Lloyd-Hart, Michael ; Milton, N. Mark. / Ground-layer wave front reconstruction from multiple natural guide stars. In: Astrophysical Journal. 2007 ; Vol. 661, No. 2 I. pp. 1332-1338.
@article{0fa9b00cd8e54bf584126f5485d032f3,
title = "Ground-layer wave front reconstruction from multiple natural guide stars",
abstract = "Observational tests of open-loop ground-layer wave front recovery have been made using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona. Such tests explore the effectiveness of wide-field seeing improvement by correction of low-lying atmospheric turbulence with ground-layer adaptive optics (GLAO). The wave fronts from the four stars were measured simultaneously on a Shack-Hartmann wave front sensor (WFS). The WFS placed a 5 × 5 array of square subapertures across the pupil of the telescope, allowing for wave front reconstruction up to the fifth radial Zernike order. We find that the wave front aberration in each star can be roughly halved by subtracting the average of the wave fronts from the other three stars. Wave front correction on this basis leads to a reduction in width of the seeing-limited stellar image by up to a factor of 3, with image sharpening effective from the visible to near-infrared wavelengths over a field of at least 2′. We conclude that GLAO correction will be a valuable tool that can increase resolution and spectrographic throughput across a broad range of seeing-limited observations.",
keywords = "Atmospheric effects, Instrumentation: adaptive optics",
author = "Christoph Baranec and Michael Lloyd-Hart and Milton, {N. Mark}",
year = "2007",
month = "6",
day = "1",
doi = "10.1086/517874",
language = "English (US)",
volume = "661",
pages = "1332--1338",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 I",

}

TY - JOUR

T1 - Ground-layer wave front reconstruction from multiple natural guide stars

AU - Baranec, Christoph

AU - Lloyd-Hart, Michael

AU - Milton, N. Mark

PY - 2007/6/1

Y1 - 2007/6/1

N2 - Observational tests of open-loop ground-layer wave front recovery have been made using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona. Such tests explore the effectiveness of wide-field seeing improvement by correction of low-lying atmospheric turbulence with ground-layer adaptive optics (GLAO). The wave fronts from the four stars were measured simultaneously on a Shack-Hartmann wave front sensor (WFS). The WFS placed a 5 × 5 array of square subapertures across the pupil of the telescope, allowing for wave front reconstruction up to the fifth radial Zernike order. We find that the wave front aberration in each star can be roughly halved by subtracting the average of the wave fronts from the other three stars. Wave front correction on this basis leads to a reduction in width of the seeing-limited stellar image by up to a factor of 3, with image sharpening effective from the visible to near-infrared wavelengths over a field of at least 2′. We conclude that GLAO correction will be a valuable tool that can increase resolution and spectrographic throughput across a broad range of seeing-limited observations.

AB - Observational tests of open-loop ground-layer wave front recovery have been made using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona. Such tests explore the effectiveness of wide-field seeing improvement by correction of low-lying atmospheric turbulence with ground-layer adaptive optics (GLAO). The wave fronts from the four stars were measured simultaneously on a Shack-Hartmann wave front sensor (WFS). The WFS placed a 5 × 5 array of square subapertures across the pupil of the telescope, allowing for wave front reconstruction up to the fifth radial Zernike order. We find that the wave front aberration in each star can be roughly halved by subtracting the average of the wave fronts from the other three stars. Wave front correction on this basis leads to a reduction in width of the seeing-limited stellar image by up to a factor of 3, with image sharpening effective from the visible to near-infrared wavelengths over a field of at least 2′. We conclude that GLAO correction will be a valuable tool that can increase resolution and spectrographic throughput across a broad range of seeing-limited observations.

KW - Atmospheric effects

KW - Instrumentation: adaptive optics

UR - http://www.scopus.com/inward/record.url?scp=34347241311&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34347241311&partnerID=8YFLogxK

U2 - 10.1086/517874

DO - 10.1086/517874

M3 - Article

AN - SCOPUS:34347241311

VL - 661

SP - 1332

EP - 1338

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 I

ER -