par Xue, Xiaoxiao;Leo, François ;Lim, Candy Haley Yi Xuan;Jaramillo-Villegas, Jose;Wang, Pei Hsun;Leaird, Daniel;Erkintalo, Miro;Qi, Minghao;Weiner, Andrew
Référence Light, science & applications, 6, 4, e16253
Publication Publié, 2017
Référence Light, science & applications, 6, 4, e16253
Publication Publié, 2017
Article révisé par les pairs
Résumé : | Simultaneous Kerr comb formation and second-harmonic generation with on-chip microresonators can greatly facilitate comb self-referencing for optical clocks and frequency metrology. Moreover, the presence of both second- and third-order nonlinearities results in complex cavity dynamics that is of high scientific interest but is still far from being well-understood. Here, we demon-strate that the interaction between the fundamental and the second-harmonic waves can provide an entirely new way of phase matching for four-wave mixing in optical microresonators, enabling the generation of optical frequency combs in the normal dispersion regime under conditions where comb creation is ordinarily prohibited. We derive new coupled time-domain mean-field equations and obtain simulation results showing good qualitative agreement with our experimental observations. Our findings provide a novel way of overcoming the dispersion limit for simultaneous Kerr comb formation and second-harmonic generation, which might prove to be especially important in the near-visible to visible range where several atomic transitions commonly used for the stabilization of optical clocks are located and where the large normal material dispersion is likely to dominate. |