Interactions Between a Soliton and a Blue-Detuned State in a Microcomb Laser
Résumé
Cavity-solitons generated within a microresonator-filtered fibre laser [1] exhibit self-emergence and recovery facilitated by the interaction of slow nonlinearities within the system [2,3]. Nonlocal nonlinear effects like thermal detuning [4] and gain saturation [5] play a pivotal role in shaping the overall characteristics of these systems [6]. These effects operate on slower timescales compared to fast phenomena such as the Kerr effect, offering potential enhancements to the robustness of solitary regimes. In this work (see Figure), we explore the nonlinear emergence and recovery of a bonded state consisting of a soliton and a continuous wave (CW), with the soliton being red-detuned and the CW blue-detuned relative to the microcavity resonance slopes. Our findings demonstrate that the blue-detuned CW and soliton emerge in distinct regions of the erbium laser spectrum, where the slow resonant nonlinearity of the amplifier exhibits a different sign. The physics underlying this state is notably complex, and our real-time measurements, conducted using Dispersive Fourier Transform (DFT), reveal an elastic bonding between the two states mediated by the system's modal structure and the slow nonlinearities.
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