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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 17 — Aug. 21, 2006
  • pp: 7541–7551

Experimental results of ground-layer and tomographic wavefront reconstruction from multiple laser guide stars

Michael Lloyd-Hart, Christoph Baranec, N. Mark Milton, Miguel Snyder, Thomas Stalcup, J. Roger, and P. Angel  »View Author Affiliations


Optics Express, Vol. 14, Issue 17, pp. 7541-7551 (2006)
http://dx.doi.org/10.1364/OE.14.007541


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Abstract

We describe results from the first multi-laser wavefront sensing system designed to support tomographic modes of adaptive optics (AO). The system, now operating at the 6.5 m MMT telescope in Arizona, creates five beacons by Rayleigh scattering of laser beams at 532 nm integrated over a range from 20 to 29 km by dynamic refocus of the telescope optics. The return light is analyzed by a Shack-Hartmann sensor that places all five beacons on a single detector, with electronic shuttering to implement the beacon range gate. A separate high-order Shack-Hartmann sensor records simultaneous measurements of wavefronts from a natural star. From open-loop measurements, we find the average beacon wavefront gives a good estimate of ground layer aberration. We present results of full tomographic wavefront analysis, enabled by supplementing the laser data with simultaneous fast image motion measurements from three stars in the field. We describe plans for an early demonstration at the MMT of closed-loop ground layer AO, and later tomographic AO.

© 2006 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
(110.6960) Imaging systems : Tomography

ToC Category:
Focus Issue: Adaptive Optics

History
Original Manuscript: March 23, 2006
Revised Manuscript: May 3, 2006
Manuscript Accepted: May 4, 2006
Published: August 21, 2006

Citation
Michael Lloyd-Hart, Christoph Baranec, N. Mark Milton, Miguel Snyder, Thomas Stalcup, and J. Roger P. Angel, "Experimental results of ground-layer and tomographic wavefront reconstruction from multiple laser guide stars," Opt. Express 14, 7541-7551 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-17-7541


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