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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 14 — Jul. 15, 2012
  • pp: 2802–2804

Speckle-metric-optimization-based adaptive optics for laser beam projection and coherent beam combining

Mikhail Vorontsov, Thomas Weyrauch, Svetlana Lachinova, Micah Gatz, and Gary Carhart  »View Author Affiliations


Optics Letters, Vol. 37, Issue 14, pp. 2802-2804 (2012)
http://dx.doi.org/10.1364/OL.37.002802


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Abstract

Maximization of a projected laser beam’s power density at a remotely located extended object (speckle target) can be achieved by using an adaptive optics (AO) technique based on sensing and optimization of the target-return speckle field’s statistical characteristics, referred to here as speckle metrics (SM). SM AO was demonstrated in a target-in-the-loop coherent beam combining experiment using a bistatic laser beam projection system composed of a coherent fiber-array transmitter and a power-in-the-bucket receiver. SM sensing utilized a 50 MHz rate dithering of the projected beam that provided a stair-mode approximation of the outgoing combined beam’s wavefront tip and tilt with subaperture piston phases. Fiber-integrated phase shifters were used for both the dithering and SM optimization with stochastic parallel gradient descent control.

© 2012 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:
Lasers and Laser Optics

History
Original Manuscript: April 9, 2012
Manuscript Accepted: May 2, 2012
Published: July 4, 2012

Citation
Mikhail Vorontsov, Thomas Weyrauch, Svetlana Lachinova, Micah Gatz, and Gary Carhart, "Speckle-metric-optimization-based adaptive optics for laser beam projection and coherent beam combining," Opt. Lett. 37, 2802-2804 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-14-2802


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