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Versatile Optical Frequency Division with Kerr-induced Synchronization at Tunable Microcomb Synthetic Dispersive Waves (2403.00109v2)

Published 29 Feb 2024 in physics.optics and physics.app-ph

Abstract: Kerr-induced synchronization (KIS) provides a new key tool for the control and stabilization of the repetition rate of a cavity soliton frequency comb. It enables direct external control of a given comb tooth of a dissipative Kerr soliton (DKS) thanks to its capture by an injected reference laser. Efficient KIS requires its coupling energy to be sufficiently large, and hence both the comb tooth and intracavity reference power must be optimized, which can be achieved through higher-order dispersion that enables phase-matched dispersive waves (DWs), where comb teeth are on resonance. However, such a design is highly restrictive, preventing arbitrary use of reference wavelengths away from the DW(s). In particular, for large spectral separations from the main pump the cavity dispersion yields large detuning between comb teeth and their respective cavity resonances, thereby decreasing the coupling energy and rendering KIS to be highly inefficient or practically impossible. Here, we demonstrate an alternative KIS method where efficient synchronization can be tailored at arbitrary modes as needed. Using a multi-color DKS created from multi-pumping a microresonator, a synthetic DW at the second-color wavepacket can be selectively created where otherwise dispersion is far too large for KIS to be experimentally feasible. Since a unique group velocity for both colors exists thanks to cross-phase modulation, the repetition rate disciplining of the secondary color wavepacket through its KIS automatically translates into the DKS microcomb control. We first investigate this color-KIS phenomenon theoretically, and then experimentally demonstrate its control and tuning of the soliton microcomb repetition rate. As a consequence, we demonstrate optical frequency division that is uncoupled from the main pump that generates the DKS.

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