TY - JOUR

T1 - Resonant Kushi-comb-like multi-frequency radiation of oscillating two-color soliton molecules

AU - Melchert, O.

AU - Willms, S.

AU - Oreshnikov, I.

AU - Yulin, A.

AU - Morgner, U.

AU - Babushkin, I.

AU - Demircan, A.

N1 - Funding Information: OM, SW, IB, UM, and AD acknowledge financial support from Deutsche Forschungsgemeinschaft (DFG) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering–Innovation Across Disciplines) (EXC 2122, Project No. 390833453). AY acknowledges financial support from Priority 2030 Academic Leadership Program and Goszadanie No. 2019-1246. IB also acknowledges support from DFG (Project No. BA4156/4-2). UM also acknowledges support from DFG (Project No. MO 850-20/1).

PY - 2023/1

Y1 - 2023/1

N2 - Nonlinear waveguides with two distinct domains of anomalous dispersion can support the formation of molecule-like two-color pulse compounds. They consist of two tightly bound subpulses with frequency loci separated by a vast frequency gap. Perturbing such a two-color pulse compound triggers periodic amplitude and width variations, reminiscent of molecular vibrations. With increasing strength of perturbation, the dynamics of the pulse compound changes from harmonic to nonlinear oscillations. The periodic amplitude variations enable coupling of the pulse compound to dispersive waves, resulting in the resonant emission of multi-frequency radiation. We demonstrate that the location of the resonances can be precisely predicted by phase-matching conditions. If the pulse compound consists of a pair of identical subpulses, inherent symmetries lead to degeneracies in the resonance spectrum. Weak perturbations lift existing degeneracies and cause a splitting of the resonance lines into multiple lines. Strong perturbations result in more complex emission spectra, characterized by well separated spectral bands caused by resonant Cherenkov radiation and additional four-wave mixing processes.

AB - Nonlinear waveguides with two distinct domains of anomalous dispersion can support the formation of molecule-like two-color pulse compounds. They consist of two tightly bound subpulses with frequency loci separated by a vast frequency gap. Perturbing such a two-color pulse compound triggers periodic amplitude and width variations, reminiscent of molecular vibrations. With increasing strength of perturbation, the dynamics of the pulse compound changes from harmonic to nonlinear oscillations. The periodic amplitude variations enable coupling of the pulse compound to dispersive waves, resulting in the resonant emission of multi-frequency radiation. We demonstrate that the location of the resonances can be precisely predicted by phase-matching conditions. If the pulse compound consists of a pair of identical subpulses, inherent symmetries lead to degeneracies in the resonance spectrum. Weak perturbations lift existing degeneracies and cause a splitting of the resonance lines into multiple lines. Strong perturbations result in more complex emission spectra, characterized by well separated spectral bands caused by resonant Cherenkov radiation and additional four-wave mixing processes.

KW - nonlinear optics

KW - nonlinear Schrödinger equation

KW - optical solitons

KW - resonant radiation

KW - soliton molecules

UR - http://www.scopus.com/inward/record.url?scp=85146425364&partnerID=8YFLogxK

U2 - 10.1088/1367-2630/acadff

DO - 10.1088/1367-2630/acadff

M3 - Article

AN - SCOPUS:85146425364

VL - 25

JO - New journal of physics

JF - New journal of physics

SN - 1367-2630

IS - 1

M1 - 013003

ER -