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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 8 — Apr. 14, 2008
  • pp: 5527–5543

A laser guide star wavefront sensor bench demonstrator for TMT

Olivier Lardière, Rodolphe Conan, Colin Bradley, Kate Jackson, and Glen Herriot  »View Author Affiliations

Optics Express, Vol. 16, Issue 8, pp. 5527-5543 (2008)

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Sodium laser guide stars (LGSs) allow, in theory, Adaptive Optics (AO) systems to reach a full sky coverage, but they have their own limitations. The artificial star is elongated due to the sodium layer thickness, and the temporal and spatial variability of the sodium atom density induces changing errors on wavefront measurements, especially with Extremely Large Telescopes (ELTs) for which the LGS elongation is larger. In the framework of the Thirty–Meter–Telescope project (TMT), the AO-Lab of the University of Victoria (UVic) has built an LGS–simulator test bed in order to assess the performance of new centroiding algorithms for LGS Shack-Hartmann wavefront sensors (SH–WFS). The design of the LGS–bench is presented, as well as laboratory SH–WFS images featuring 29×29 radially elongated spots, simulated for a 30–m pupil. The errors induced by the LGS variations, such as focus and spherical aberrations, are characterized and discussed. This bench is not limited to SH–WFS and can serve as an LGS–simulator test bed to any other LGS–AO projects for which sodium layer fluctuations are an issue.

© 2008 Optical Society of America

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

ToC Category:
Adaptive Optics

Original Manuscript: January 31, 2008
Revised Manuscript: March 31, 2008
Manuscript Accepted: April 1, 2008
Published: April 4, 2008

Olivier Lardiere, Rodolphe Conan, Colin Bradley, Kate Jackson, and Glen Herriot, "A laser guide star wavefront sensor bench demonstrator for TMT," Opt. Express 16, 5527-5543 (2008)

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