Diverse interlocked switching waves in cavity-enhanced second-harmonic generation

Year: 2024

Authors: Wu G.Z., Hou C., Wei M.T., Chen S.H., Lin T., Baronio F., Ni Z.H.

Autors Affiliation: Southeast Univ, Sch Phys, Nanjing 211189, Peoples R China; Southeast Univ, Frontiers Sci Ctr Mobile Informat Commun & Secur, Nanjing 211189, Peoples R China; Purple Mt Labs, Nanjing 211111, Peoples R China; Southeast Univ, Adv Photon Ctr, Sch Elect Sci & Engn, Nanjing 210096, Peoples R China; Zhejiang Univ, State Key Lab Silicon & Adv Semicond Mat, Hangzhou 310027, Peoples R China; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; CNR, INO, Via Branze 38, I-25123 Brescia, Italy.

Abstract: We investigate the intriguing dynamics and existence conditions of temporal two-color flat-top solitons, termed interlocked switching waves (ISWs), in driven quadratic microresonators via a phase-matched second-harmonic generation process. We show that the formation of two-color ISWs relies strongly upon the pump frequency detuning, the group-velocity dispersion, and the temporal walk-off, and that the ISWs at the negative detuning may behave differently from the ones formed at the positive detuning, due to the asymmetric modulation instability of homogeneous steady-state solutions. In contrast to previous predictions, stable ISW states are found to occur as well on interacting harmonics that both have anomalous group-velocity dispersions when prepared at the negative detuning. Moreover, we unveil that large temporal walk-off contributes to the formation of two-color ISWs at the positive detuning but tends to deteriorate at the negative detuning. Our results help improve our understanding of two-color ISWs and thereby pave the way for highly efficient octave-spanning dual-band comb generation.

Journal/Review: OPTICS EXPRESS

Volume: 32 (26)      Pages from: 45436  to: 45452

More Information: National Natural Science Foundation of China (12374301, 11974075, 62105061) ; National Key Research and Development Program of China (2021YFA1200700) ; State Key Laboratory of Silicon and Advanced Semiconductor Materials (SKL2023-04) ; Progetti di Ricerca di Interesse Nazionale (PRIN) (20 20X4T57A) ; PRIN funded by European Union-Next Generation EU (20222NCTCY) .
KeyWords: Frequency Comb Generation; Pulse Kerr Combs; Solitary Waves; Modulational Instability; Pattern-formation; Domain-walls; Solitons; Dispersion; Nonlinearities; Radiation
DOI: 10.1364/OE.542276