摘要
We report a broadband two-dimensional(2 D) Kerr and Raman–Kerr frequency comb generation in a silica bottle resonator accounting for azimuthal and axial degrees of freedom and pioneer a method that allows for controlled and reversible switching between a four wave mixing(FWM) state and a stimulated Raman scattering state. The repetition rate of the Raman–Kerr comb is not an integer number of the free spectral range, which spans more than 242 nm with hundreds of teeth. We show that, experimentally and numerically, multiple 2 D comb regimes can be selectively accessed via dispersion engineering by exciting different orders of axial modes or modifying the curvature of the axial profile, involving cascaded FWM, Raman lasing, and Raman-assisted FWM. The effect of axial curvature on dispersion is associated with the axial mode number in bottle resonators. Our approach enables dispersion and spectral engineering flexibility in any resonator with localized axial modes.
基金
National Natural Science Foundation of China(62005071)
Natural Science Foundation of Anhui Province(2008085QF312)
Fundamental Research Funds for the Central Universities(JZ2019HGBZ0122,JZ2019H GTA0050)
National Key Research and Development Program of China(2019YFE010747)。
