Titre du document

Measurement of atmospheric wavefront distortion using scattered light from a laser guide-star

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Nom du Corpus

AstroConcepts

Auteur(s)
  • R. Q. Fugate
  • D. L. Fried
  • G. A. Ameer
  • B. R. Boeke
  • S. L. Browne
  • P. H. Roberts
  • R. E. Ruane
  • G. A. Tyler
  • L. M. Wopat
Résumé

THE possibility of using an artificial 'guide-star' to measure optical wavefront distortion caused by atmospheric turbulence has been discussed for some time14, but few experimental data are available5. Here we report experimental results demonstrating that atmospheric wavefront distortion can be measured by taking fast 'snapshots' of a guide-star formed by light scattered from a laser beam focused in the upper atmosphere. These results agree with a theoretical prediction6 that the mean-square wavefront error created by using an artificial guide-star at a finite distance rather than a real (infinitely distant) star is proportional to the five-thirds power of the telescope aperture. Using this understanding of the physics, we have demonstrated continuous, real-time atmospheric compensation of a 1.5-m telescope using a high-pulse-rate laser, pulse-synchronized wavefront sensor and deformable mirror, and have been able to resolve the 1.3-arcsecond binary star 53 Ursa Majoris in an exposure time of only one second.

Langue(s) du document
Indéterminé
Année de publication
1991
Revue

Nature

Éditeur
Nature
Type de publication
journal
Type de document
other
Présence de XML structuré
Oui
Version de PDF
1.4
Score de qualité du texte
3.789
Nom du concept
  • Artificial guide stars
Catégories Science-Metrix
  • 1 - general ; 2 - general science & technology ; 3 - general science & technology
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences exactes et technologie ; 3 - terre, ocean, espace ; 4 - astronomie
Catégories Scopus
  • 1 - General ; 2 - Multidisciplinary ; 3 - Multidisciplinary
Catégories WoS
  • 1 - science ; 2 - multidisciplinary sciences
Identifiant ISTEX
718D7943D2AE98AAC5B8564DB506C3D949546C7B
ark:/67375/GT4-NC3KZKGQ-7
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