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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 22 — Nov. 15, 2011
  • pp: 4455–4457

Experimental demonstration of coherent beam combining over a 7 km propagation path

Thomas Weyrauch, Mikhail A. Vorontsov, Gary W. Carhart, Leonid A. Beresnev, Andrey P. Rostov, Ernst E. Polnau, and Jony Jiang Liu  »View Author Affiliations


Optics Letters, Vol. 36, Issue 22, pp. 4455-4457 (2011)
http://dx.doi.org/10.1364/OL.36.004455


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Abstract

We demonstrate coherent combining (phase locking) of seven laser beams emerging from an adaptive fiber- collimator array over a 7 km atmospheric propagation path using a target-in-the-loop (TIL) setting. Adaptive control of the piston and the tip and tilt wavefront phase at each fiber-collimator subaperture resulted in automatic focusing of the combined beam onto an unresolved retroreflector target (corner cube) with precompensation of quasi-static and atmospheric turbulence-induced phase aberrations. Both phase locking (piston) and tip–tilt control were performed by maximizing the target-return optical power using iterative stochastic parallel gradient descent (SPGD) techniques. The performance of TIL coherent beam combining and atmospheric mitigation was significantly increased by using an SPGD control variation that accounts for the round-trip propagation delay (delayed SPGD).

© 2011 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1285) Atmospheric and oceanic optics : Atmospheric correction
(140.3298) Lasers and laser optics : Laser beam combining

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: August 9, 2011
Revised Manuscript: October 11, 2011
Manuscript Accepted: October 12, 2011
Published: November 15, 2011

Citation
Thomas Weyrauch, Mikhail A. Vorontsov, Gary W. Carhart, Leonid A. Beresnev, Andrey P. Rostov, Ernst E. Polnau, and Jony Jiang Liu, "Experimental demonstration of coherent beam combining over a 7 km propagation path," Opt. Lett. 36, 4455-4457 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-22-4455


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References

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