Sanyal Swarnava, Okawachi Yoshitomo, Zhao Yun, Kim Bok Young, McNulty Karl J, Lipson Michal, Gaeta Alexander L
Columbia University, Department of Applied Physics and Applied Mathematics, New York, New York 10027, USA.
Columbia University, Department of Electrical Engineering, New York, New York 10027, USA.
Phys Rev Lett. 2025 Mar 28;134(12):123801. doi: 10.1103/PhysRevLett.134.123801.
The nonlinear interaction of a microresonator pumped by a laser has revealed complex dynamics, including soliton formation and chaos. Initial studies of coupled-resonator systems reveal even more complicated dynamics that can lead to deterministic mode locking and efficient comb generation. Here, we perform theoretical analysis and experiments that provide insight into the dynamical behavior of coupled-resonator systems operating in the normal group-velocity-dispersion regime. Our stability analysis and simulations reveal that the strong mode-coupling regime, which gives rise to spectrally broad comb states, can lead to an instability mechanism in the auxiliary resonator that destabilizes the comb state and prevents mode locking. We find that this instability can be suppressed by introducing loss in the auxiliary resonator. We investigate the stability of both single- and multipulse solutions and verify our theoretical predictions by performing experiments in a silicon-nitride platform. Our results provide an understanding for accessing broad, efficient, relatively flat high-power mode-locked combs for numerous applications in spectroscopy, time-frequency metrology, and data communications.
由激光泵浦的微谐振器的非线性相互作用揭示了复杂的动力学特性，包括孤子形成和混沌现象。对耦合谐振器系统的初步研究揭示了更为复杂的动力学特性，这些特性可导致确定性锁模和高效梳状波产生。在此，我们进行了理论分析和实验，以深入了解在正常群速度色散 regime 中运行的耦合谐振器系统的动力学行为。我们的稳定性分析和模拟表明，产生光谱宽带梳状态的强模式耦合 regime 会导致辅助谐振器中的一种不稳定性机制，该机制会破坏梳状态的稳定性并阻止锁模。我们发现，通过在辅助谐振器中引入损耗可以抑制这种不稳定性。我们研究了单脉冲和多脉冲解的稳定性，并通过在氮化硅平台上进行实验验证了我们的理论预测。我们的结果为在光谱学、时频计量学和数据通信等众多应用中获得宽带、高效、相对平坦的高功率锁模梳状波提供了理解。
