Soliton microcombs offer a compact means to generate equally spaced spectral lines via a delicate balance of Kerr nonlinearity and anomalous dispersion in nonlinear microresonators. However, the simultaneous excitatio...Soliton microcombs offer a compact means to generate equally spaced spectral lines via a delicate balance of Kerr nonlinearity and anomalous dispersion in nonlinear microresonators. However, the simultaneous excitation of multiple transverse mode families can disrupt soliton formation and degrade spectral uniformity. Here, we demonstrate universal spectral purification of microresonators with ultrahigh intrinsic Q factors exceeding 10^(8). An aluminum ring is deposited onto a silica microdisk to eliminate high-order transverse modes selectively by introducing additional losses. The resulting soliton microcombs exhibit an ideal sech^(2) spectral envelope and enable continuous tuning of the soliton repetition frequency over a 300 kHz range without compromising phase noise performance. Our approach can be universally applied to integrated photonic platforms to reduce transverse modes crowding in high-Q resonators, facilitating the generation of broadband classical and quantum light with ideal performance.展开更多
基金National Natural Science Foundation of China(62222515, 12174438)Innovation Program for Quantum Science and Technology (2023ZD0301100)+2 种基金National Key Research and Development Program of China(2021YFA1400700)Basic Frontier Science Research Program of Chinese Academy of Sciences (ZDBS-LYJSC003)CAS Project for Young Scientists in Basic Research (YSBR-100)
文摘Soliton microcombs offer a compact means to generate equally spaced spectral lines via a delicate balance of Kerr nonlinearity and anomalous dispersion in nonlinear microresonators. However, the simultaneous excitation of multiple transverse mode families can disrupt soliton formation and degrade spectral uniformity. Here, we demonstrate universal spectral purification of microresonators with ultrahigh intrinsic Q factors exceeding 10^(8). An aluminum ring is deposited onto a silica microdisk to eliminate high-order transverse modes selectively by introducing additional losses. The resulting soliton microcombs exhibit an ideal sech^(2) spectral envelope and enable continuous tuning of the soliton repetition frequency over a 300 kHz range without compromising phase noise performance. Our approach can be universally applied to integrated photonic platforms to reduce transverse modes crowding in high-Q resonators, facilitating the generation of broadband classical and quantum light with ideal performance.
