Abstract
Dissipative Kerr solitons are self-sustaining optical wavepackets in resonators. They use the Kerr nonlinearity to both compensate dispersion and offset optical loss. Besides providing insights into nonlinear resonator physics, they can be applied in frequency metrology, precision clocks, and spectroscopy. Like other optical solitons, the dissipative Kerr soliton can radiate power as a dispersive wave through a process that is the optical analogue of Cherenkov radiation. Dispersive waves typically consist of an ensemble of optical modes. Here, a limiting case is studied in which the dispersive wave is concentrated into a single cavity mode. In this limit, its interaction with the soliton induces hysteresis behaviour in the soliton’s spectral and temporal properties. Also, an operating point of enhanced repetition-rate stability occurs through balance of dispersive-wave recoil and Raman-induced soliton-self-frequency shift. The single-mode dispersive wave can therefore provide quiet states of soliton comb operation useful in many applications.
Highlights
Dissipative Kerr solitons are self-sustaining optical wavepackets in resonators
To characterize the frequency spectrum of the resonator, mode frequencies were measured from 190.95 THz (1,570 nm) to 195.94 THz (1,530 nm) using an external-cavity diode laser calibrated by a fibre Mach– Zehnder interferometer[4]
Microfabrication control of resonator diameter, oxide thickness and wedge angle all impact the spectral placement of mode families
Summary
Dissipative Kerr solitons are self-sustaining optical wavepackets in resonators. They use the Kerr nonlinearity to both compensate dispersion and offset optical loss. In microcomb research[8,9] soliton formation produces phase-locked spectra with reproducible envelopes, as required in frequency comb applications[10,11,12,13,14] Their unusual properties and interactions create a rich landscape for research in nonlinear optical phenomena[5,15,16,17,18,19,20,21,22,23,24]. The quiet operation point is shown to reduce technical noise contributions to the soliton pulse repetition rate Both this regime of operation and the hysteresis behaviour are measured and modelled theoretically
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