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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 22, Iss. 12 — Dec. 1, 2005
  • pp: 2719–2729

Tip–tilt reconstruction with a single dim natural guide star in multiconjugate adaptive optics with laser guide stars

Bruno Femenía  »View Author Affiliations

JOSA A, Vol. 22, Issue 12, pp. 2719-2729 (2005)

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A solution to the problem of detecting the tip–tilt modes in multiconjugate adaptive optics (MCAO) with laser guide stars (LGS) is presented. This solution requires the presence of only a single relatively dim natural guide star (NGS) within the reconstructed field of view (FoV). The dim NGS is used for the reconstruction of the tip–tilt modes on the entire FoV, while the tomographic reconstruction of second-order and higher-order modes is made possible by having an LGS constellation with LGSs at different heights. Due to the relatively low brightness required for the tip–tilt NGS and the large corrected FoV (as compared with the case of conventional adaptive optics) the presented solution provides a means to achieve near-diffraction-limited performance of a 10 - m -class telescope in the near infrared over a large portion of the sky. Sky coverage calculations assuming median seeing conditions indicate that this technique could be applied to 75% (95%) of the sky, achieving corrections with an average Strehl ratio 0.42 ( 0.33 ) in the 2.2 μ m K band across the 1.5 reconstructed FoV.

© 2005 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(010.7060) Atmospheric and oceanic optics : Turbulence
(010.7350) Atmospheric and oceanic optics : Wave-front sensing

ToC Category:
Atmospheric Optics

Original Manuscript: December 23, 2004
Revised Manuscript: April 13, 2005
Manuscript Accepted: May 10, 2005
Published: December 1, 2005

Bruno Femenía, "Tip–tilt reconstruction with a single dim natural guide star in multiconjugate adaptive optics with laser guide stars," J. Opt. Soc. Am. A 22, 2719-2729 (2005)

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