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



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



Optics Letters 37(14): 2802-2804



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.

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Accession: 055871789

Download citation: RISBibTeXText

PMID: 22825139

DOI: 10.1364/ol.37.002802


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