Photonics Research, 2022, 10 (1): 01000148, Published Online: Dec. 14, 2021  

Spatial cage solitons—taming light bullets Download: 551次

Author Affiliations
1 Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, 12489 Berlin, Germany
2 School of Computer and Communication Engineering, University of Science and Technology Beijing (USTB), Beijing 100083, China
3 Institute of Quantum Optics, Leibniz University Hannover, 30167 Hannover, Germany
4 Institut für Physik, Humboldt Universität zu Berlin, 12489 Berlin, Germany
Abstract
Multimode nonlinear optics is used to overcome a long-standing limitation of fiber optics, tightly phase locking several spatial modes and enabling the coherent transport of a wave packet through a multimode fiber. A similar problem is encountered in the temporal compression of multimillijoule pulses to few-cycle duration in hollow gas-filled fibers. Scaling the fiber length to up to 6 m, hollow fibers have recently reached 1 TW of peak power. Despite the remarkable utility of the hollow fiber compressor and its widespread application, however, no analytical model exists to enable insight into the scaling behavior of maximum compressibility and peak power. Here we extend a recently introduced formalism for describing mode locking to the analog scenario of locking spatial fiber modes together. Our formalism unveils the coexistence of two soliton branches for anomalous modal dispersion and indicates the formation of stable spatiotemporal light bullets that would be unstable in free space, similar to the temporal cage solitons in mode-locking theory. Our model enables deeper understanding of the physical processes behind the formation of such light bullets and predicts the existence of multimode solitons in a much wider range of fiber types than previously considered possible.

Chao Mei, Ihar Babushkin, Tamas Nagy, Günter Steinmeyer. Spatial cage solitons—taming light bullets[J]. Photonics Research, 2022, 10(1): 01000148.

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