National Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USA.
Nat Commun. 2015 Jan 7;6:5668. doi: 10.1038/ncomms6668.
Experiments and theoretical modelling yielded significant progress toward understanding of Kerr-effect induced optical frequency comb generation in microresonators. However, the simultaneous Kerr-mediated interaction of hundreds or thousands of optical comb frequencies with the same number of resonator modes leads to complicated nonlinear dynamics that are far from fully understood. An important prerequisite for modelling the comb formation process is the knowledge of phase and amplitude of the comb modes as well as the detuning from their respective microresonator modes. Here, we present comprehensive measurements that fully characterize optical microcomb states. We introduce a way of measuring resonator dispersion and detuning of comb modes in a hot resonator while generating an optical frequency comb. The presented phase measurements show unpredicted comb states with discrete π and π/2 steps in the comb phases that are not observed in conventional optical frequency combs.
实验和理论模型在理解微谐振器中 Kerr 效应诱导的光频梳产生方面取得了重大进展。然而，数百或数千个光频梳频率与相同数量的谐振器模式的同时 Kerr 介导相互作用导致了复杂的非线性动力学，远未完全理解。对梳状形成过程进行建模的一个重要前提是了解梳状模式的相位和幅度以及它们与各自微谐振器模式的失谐。在这里，我们展示了全面的测量结果，这些结果充分描述了光微梳的状态。我们介绍了一种在产生光频梳的同时测量热谐振器中谐振器色散和梳状模式失谐的方法。所提出的相位测量显示了梳状相位中的离散 π 和 π/2 阶跃，这在传统的光频梳中是观察不到的。
