We study guided self-imaging schemes useful to obtain Passive Laser Resonators Coupling (PLRC) for CoherentBeam Combining (CBC). Self-imaging schemes are well established methods for PLRC, but they are usually consideredlimited by large values of edge diffractive losses. In facts the Talbot effect (exact diffractive self-imaging) is obtained withinfinite arrays only. This problem can be opposed by using a guided self-imaging that extends the finite array by means ofa kaleidoscopic effect. This can be done in 2D with square or hexagonal symmetry or generating an infinite 1D array bywinding up a linear array on a circle. In this case cyclic boundary conditions exactly produce an infinite array in theazimuthal direction. We report on numerical simulations performed to assess the coupling efficiency with particularattention to the alignment tolerance. Calculations are carried out with reference to a system of several fiber lasers. Ourresults indicate this as a viable solution for fiber lasers CBC.
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