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There exists the phase ambiguity problem in the coherent beam combining (CBC)system with centrosymmetric arrays, which means that multiple different pistonaberrations may generate the same far-field image. This will cause that thefar-field image can not correctly reflect the phase information, resulting inthe performance degradation of image-based intelligent algorithms. In thispaper, we make a theoretical analysis on phase ambiguity. To the best of ourknowledge, we give the number and descriptions of all solutions of the phaseambiguity problem in above system for the first time. A method to solve phaseambiguity is proposed, which requires no additional optical devices. Wedesigned simulations to verify our conclusions and methods. We believe that ourwork solves the phase ambiguity problem in theory and is conducive to improvingthe performance of image-based algorithms. In addition, we designed a two-stagealgorithm to generate Bi-beam, which have valuables application in laserpropagation.

Discussion on phase ambiguity and multiple beam generation in coherent beam combining system