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Optics Letters

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  • Vol. 24, Iss. 10 — May. 15, 1999
  • pp: 637–639

Experimental validation of a technique to measure tilt from a laser guide star

Mikhail S. Belen’kii, Stephen J. Karis, James M. Brown II, and Robert Q. Fugate  »View Author Affiliations


Optics Letters, Vol. 24, Issue 10, pp. 637-639 (1999)
http://dx.doi.org/10.1364/OL.24.000637


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Abstract

We have experimentally demonstrated for what is believed to be the first time a method for sensing wave-front tilt with a laser guide star (LGS). The tilt components of wave fronts were measured synchronously from the LGS by use of a telescope with a 0.75-m effective aperture and from the star Polaris by use of a 1.5-m telescope. The Rayleigh guide star was formed at an altitude of 6 km and at a corresponding range of 10.5 km by projection of a focused beam at Polaris from the full aperture at the 1.5-m telescope. Both telescope mounts were unpowered and bolted in place, allowing us to reduce substantially the telescope vibration. The maximum value of the measured cross-correlation coefficient between the tilt for Polaris and the LGS is 0.71. The variations of the measured cross-correlation coefficient in the range from 0.22 to 0.71 are caused by turbulence at altitudes above 6 km, which was not sampled by the laser beacon but affected tilt for Polaris, the cone effect for turbulence below 6 km, residual mount jitter of the telescopes, and variations of the signal/noise ratio. The results support our concept of sensing atmospheric tilt by observing a LGS with an auxiliary telescope and indicate that this method is a possible solution for the tip–tilt problem.

© 1999 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.1300) Atmospheric and oceanic optics : Atmospheric propagation

Citation
Mikhail S. Belen’kii, Stephen J. Karis, James M. Brown II, and Robert Q. Fugate, "Experimental validation of a technique to measure tilt from a laser guide star," Opt. Lett. 24, 637-639 (1999)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-24-10-637


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References

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