Experimental observation of spontaneous emission of space-time wavepacket in a multimode optical fiber

• DOI: 10.48550/arxiv.2208.06598
• Publication Date: 2022-01-01
• Authors: Karolina Stefańska; Pierre Béjot; Karol Tarnowski; Bertrand Kibler
• Keywords: 0103 physical sciences; FOS: Physical sciences; 01 natural sciences; Physics - Optics; Optics (physics.optics)

We provide a complete analysis, from theory to experiment, of the spontaneous emergence discretized conical wave X-type (i.e., localized 2D+1 space-time wavepacket) when an intense ultrashort pulse nonlinearly propagates in multimode fiber. In particular, we reveal that this spatiotemporal phenomenon corresponds broadband intermodal dispersive emission unsteady structure formed during nonlinear propagation. Theoretical phase-matching predictions are experimentally and numerically confirmed commercially-available step-index Our results general understanding phase-matched radiations emitted by waves multidimensional optical system.