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