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arXiv 2108.01322physics.opticsnlin.PS
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近零色散时间克尔腔孤子存在性和不稳定性动力学的观测

Observations of Existence and Instability Dynamics of Near-Zero-Dispersion Temporal Kerr Cavity Solitons

Zongda Li, Yiqing Xu, Caleb Todd, Gang Xu, Stéphane Coen, Stuart G. Murdoch, Miro Erkintalo

摘要:

耗散克尔腔孤子(CS)是在驱动光谐振腔中表现出来的持续光脉冲,在过去的十年中引起了人们的极大关注。虽然绝大多数研究都围绕着谐振器表现出强烈的异常色散的条件,但最近的研究表明,在近零色散驱动的条件下,可以产生具有独特特性和动力学的孤子。在这里,我们报告在这种条件下的克尔CS的存在性和稳定性动力学的实验研究。特别是,我们通过实验探索了孤立子的存在范围,并研究了当群速度色散接近零时,它们的呼吸不稳定性如何改变,使得高阶色散项发挥重要作用。一方面,我们的实验直接证实了早期的理论工作,预测(i)呼吸近零色散孤子发射多色色散辐射,(ii)高阶色散可以扩展孤子稳定的范围。另一方面,我们的实验还揭示了一种新的交叉情况,即高阶色散的影响从稳定到不稳定。我们的综合实验样品孤子动力学在正常和异常色散制度,我们的结果是在很好的协议与数值模拟和理论预测。

英文摘要:

Dissipative Kerr cavity solitons (CSs) are persisting pulses of light that manifest themselves in driven optical resonators and that have attracted significant attention over the last decade. Whilst the vast majority of studies have revolved around conditions where the resonator exhibits strong anomalous dispersion, recent studies have shown that solitons with unique characteristics and dynamics can arise under conditions of near-zero-dispersion driving. Here we report on experimental studies of the existence and stability dynamics of Kerr CSs under such conditions. In particular, we experimentally probe the solitons' range of existence and examine how their breathing instabilities are modified when group-velocity dispersion is close to zero, such that higher-order dispersion terms play a significant role. On the one hand, our experiments directly confirm earlier theoretical works that predict (i) breathing near-zero-dispersion solitons to emit polychromatic dispersive radiation, and (ii) that higher-order dispersion can extend the range over which the solitons are stable. On the other hand, our experiments also reveal a novel cross-over scenario, whereby the influence of higher-order dispersion changes from stabilising to destabilising. Our comprehensive experiments sample soliton dynamics both in the normal and anomalous dispersion regimes, and our results are in good agreement with numerical simulations and theoretical predictions.

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