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Article Dans Une Revue Physical Review Letters Année : 2021

Discretized conical waves in multimode optical fibers

Résumé

Multimode optical fibers has emerged as the platform that will bridge the gap between nonlinear optics in bulk media and in single-mode fibers. However, the understanding of the transition between these two research fields still remains incomplete despite numerous investigations of intermodal nonlinear phenomena and spatiotemporal coupling. Some of the striking phenomena observed in bulk media with ultrashort and ultra-intense pulses (i.e., conical emission, harmonic generation and light bullets) require a deeper insight to be possibly unveiled in multimode fibers. Here we generalize the concept of conical waves described in bulk media towards structured media, such as multimode optical fibers, in which only a discrete and finite number of modes can propagate. Such propagation-invariant optical wave packets can be linearly generated, in the limit of superposed monochromatic fields, by shaping their spatiotemporal spectrum, while they can spontaneously emerge when a rather intense short pulse propagates nonlinearly in a multimode waveguide, whatever the dispersion regime and waveguide geometry. The modal distribution of optical fibers then provides a discretization of conical emission (e.g., discretized X-waves). Future experiments in commercially-available multimode fibers could reveal different forms of conical emission and supercontinuum light bullets.
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Dates et versions

hal-02998540 , version 1 (13-11-2020)

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Bertrand Kibler, Pierre Béjot. Discretized conical waves in multimode optical fibers. Physical Review Letters, 2021, 126 (2), pp.023902. ⟨10.1103/PhysRevLett.126.023902⟩. ⟨hal-02998540⟩
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