Stabilization of Spatiotemporal Dissipative Solitons in Multimode Fiber Lasers by External Phase Modulation

Abstract

In this work, we introduce a method for stabilizing spatiotemporal solitons. These solitons correspond to light bullets in multimode optical fiber lasers, energy-scalable waveguide oscillators and amplifiers, localized coherent patterns in Bose-Einstein condensates, etc. We show that a three-dimensional confinement potential, formed by a spatial transverse (radial) parabolic graded refractive index and dissipation profile, combined with quadratic temporal phase modulation, may permit the generation of stable spatiotemporal dissipative solitons. This corresponds to combining phase mode-locking with the distributed Kerr-lens mode-locking. Our study of the soliton characteristics and stability is based on analytical and numerical solutions of the generalized dissipative Gross-Pitaevskii equation. This approach could lead to higher energy (or condensate mass) harvesting in coherent spatio-temporal beam structures formed in multimode fiber lasers, waveguide oscillators, and weakly-dissipative Bose-Einstein condensates.

14 pages, 19 figures

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• Three-Dimensional Light Bullets in Arrays of Waveguides
• Thermodynamic theory of highly multimoded nonlinear optical systems
• Dissipative light bullets in Kerr cavities: multi-stability, clustering, and rogue waves
• Spatiotemporal solitons in dispersion-managed multimode fibers
• A "metaphorical" nonlinear multimode fiber laser approach to weakly-dissipative Bose-Einstein condensates