Abstract

Kerr cavity solitons (CSs) are pulses that propagate unperturbed in a driven nonlinear optical resonator. They currently play a crucial role in the formation of highly coherent optical frequency combs [1]. CSs are well described by the so-called Lugiato-Lefever equation (LLE) [^1-2]. The CS peak power as a function of the driving laser phase detuning from the closest cavity resonance, δ₀, obtained by numerical continuation of the LLE, is shown in Fig. 1a. The highest reachable detuning, δ_max, is proportional to the driving power P_in. In particular, the CS peak power (duration) increases (decreases) with the cavity detuning. Then, to generate the shortest CSs with the highest peak power, one should operate at the largest detuning [^2-3]. However, for short CSs in resonators made of silica, the stimulated Raman scattering (SRS) must be considered. This inelastic scattering is responsible for red-shifting the CS spectrum from the driving frequency (see Fig 1a, inset).

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