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Formation and collision of multistability-enabled composite dissipative Kerr solitons
Physical Review X ( IF 12.5 ) Pub Date : 
Wenle Weng, Romain Bouchand, and Tobias J. Kippenberg

Multistability in Kerr resonators which are driven by continuous or modulated optical waves gives rise to the superposition of distinct nonlinear states, yielding a unique platform for studying complex soliton dynamics. Here, by pumping a crystalline microresonator with two lasers that are frequency detuned from each other by one or multiple cavity free spectral ranges, we go beyond the traditional bichromatic pumping framework and enter an unexplored multistability regime that allows observing novel dynamics including composite solitons and successive soliton collisions. We generate complex frequency comb patterns, observing the velocity mismatch between the solitons and the dual-pumping induced lattice traps, and showing the synchronization of the repetition rates of constituent distinct solitons under the influence of index-barrier-induced inter-soliton repulsion. We also demonstrate soliton collisions, and observe transient soliton response with spectral analysis and ultrafast imaging, highlighting the eigenfrequency of dissipative soliton dynamics that coincides the ``soliton (𝒮)-resonance’’. Furthermore, we exploit the higher-order dispersion effect to manipulate the intrinsic group velocity mismatch between distinct solitons and demonstrate reversible switching between the composite soliton state and the soliton collisional state. Our findings bring to light the rich physics of the Kerr multistability, and may equally be useful in microcomb-based spectroscopy and metrology.

中文翻译:

多稳定性复合耗散克尔孤子的形成与碰撞

由连续或调制光波驱动的Kerr谐振器的多重稳定性引起了明显的非线性状态的叠加,从而为研究复杂的孤子动力学提供了一个独特的平台。在这里,通过用两个激光器对晶体微谐振器进行泵浦,两个激光器的频率在一个或多个腔的自由光谱范围内相互失谐,我们超越了传统的双色泵浦框架,进入了一种未经探索的多稳定性机制,该机制允许观察包括复合孤子和连续波在内的新型动力学。孤子碰撞。我们生成复杂的频率梳模式,观察孤子与双泵诱导晶格陷阱之间的速度失配,并显示了在指数势垒诱导的孤子间排斥作用下各成分孤子的重复率同步。我们还演示了孤子碰撞,并通过光谱分析和超快成像观察了瞬态孤子响应,突出了与``孤子(𝒮)-谐振''。此外,我们利用高阶色散效应来操纵不同孤子之间的固有群速度失配,并证明了复合孤子状态和孤子碰撞状态之间的可逆转换。我们的发现揭示了Kerr多稳定性的丰富物理原理,并且在基于微梳的光谱学和计量学中同样有用。
更新日期:2020-03-16
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