Opt Lett. 2018 Sep 1;43(17):4180-4183. doi: 10.1364/OL.43.004180.
Recent experiments have demonstrated the generation of widely spaced parametric sidebands that can evolve into "clustered" optical frequency combs in Kerr microresonators. Here we describe the physics that underpins the formation of such clustered comb states. In particular, we show that the phase matching required for the initial sideband generation is such that (at least) one of the sidebands experiences anomalous dispersion, enabling the sideband to drive frequency comb formation via degenerate and non-degenerate four-wave mixing. We validate our proposal through a combination of experimental observations made in a magnesium-fluoride microresonator and corresponding numerical simulations. We also investigate the coherence properties of the resulting clustered frequency combs. Our findings provide valuable insights on the generation and dynamics of widely spaced parametric sidebands and clustered frequency combs in Kerr microresonators.
最近的实验表明，在 Kerr 微谐振器中可以产生广泛间隔的参量边带，这些边带可以演变成“簇状”光频梳。在这里，我们描述了支持这种簇状梳状状态形成的物理原理。具体来说，我们表明，初始边带产生所需的相位匹配使得（至少）一个边带经历反常色散，从而使边带通过简并和非简并四波混频来驱动频梳形成。我们通过在氟化镁微谐振器中进行的实验观察和相应的数值模拟相结合来验证我们的建议。我们还研究了所得簇状频梳的相干特性。我们的研究结果为 Kerr 微谐振器中广泛间隔的参量边带和簇状频梳的产生和动力学提供了有价值的见解。
