Meng Fanchao, Lapre Coraline, Billet Cyril, Sylvestre Thibaut, Merolla Jean-Marc, Finot Christophe, Turitsyn Sergei K, Genty Goëry, Dudley John M
Institut FEMTO-ST, Université Bourgogne Franche-Comté CNRS UMR 6174, 25000, Besançon, France.
Laboratoire Interdisciplinaire Carnot de Bourgogne, Université Bourgogne Franche-Comté CNRS UMR 6303, 21078, Dijon, France.
Nat Commun. 2021 Sep 22;12(1):5567. doi: 10.1038/s41467-021-25861-4.
Understanding dynamical complexity is one of the most important challenges in science. Significant progress has recently been made in optics through the study of dissipative soliton laser systems, where dynamics are governed by a complex balance between nonlinearity, dispersion, and energy exchange. A particularly complex regime of such systems is associated with noise-like pulse multiscale instabilities, where sub-picosecond pulses with random characteristics evolve chaotically underneath a much longer envelope. However, although observed for decades in experiments, the physics of this regime remains poorly understood, especially for highly-nonlinear cavities generating broadband spectra. Here, we address this question directly with a combined numerical and experimental study that reveals the physical origin of instability as nonlinear soliton dynamics and supercontinuum turbulence. Real-time characterisation reveals intracavity extreme events satisfying statistical rogue wave criteria, and both real-time and time-averaged measurements are in quantitative agreement with modelling.
理解动力学复杂性是科学领域最重要的挑战之一。最近，通过对耗散孤子激光系统的研究，光学领域取得了重大进展，在该系统中，动力学由非线性、色散和能量交换之间的复杂平衡所支配。这种系统的一个特别复杂的状态与类噪声脉冲多尺度不稳定性有关，其中具有随机特征的亚皮秒脉冲在长得多的包络下混沌地演化。然而，尽管在实验中已经观察了几十年，但这种状态的物理机制仍然知之甚少，尤其是对于产生宽带光谱的高度非线性腔。在这里，我们通过数值和实验相结合的研究直接解决这个问题，揭示了不稳定性的物理起源是非线性孤子动力学和超连续谱湍流。实时表征揭示了满足统计 rogue 波标准的腔内极端事件，实时和时间平均测量结果与建模在定量上一致。
