Abstract
Owing to the coupling and superposition of the modes, a random speckle will be generated in case a laser beam passes through a multi-core fiber (MCF). Based on the feedback-based wavefront shaping technique, the optimized phase map can be obtained by the artificial immune algorithm. The random speckle can be transformed into a focal pattern by imposing the optimized phase map on the spatial light modulator. It is shown that the polarization state of the focal spot can be controlled and a linearly polarized focal spot can be generated. In addition, we further demonstrate the evolution of the intensity and the polarization of the focal spot along the propagation distance. The results are useful for the application of the MCF in biological and medical domains.
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