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• W4386427861 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, <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$delta_{0}$</tex> , obtained by numerical continuation of the LLE, is shown in Fig. 1a. The highest reachable detuning, <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$delta_{max}$</tex> , is proportional to the driving power <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$P_{in}$</tex> . 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). A few years ago, Wang et al. demonstrated in [4] that the SRS imposes a fundamental limit to the peak power and the temporal duration of CSs, as the highest detuning for which a stable CS exists <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$(delta_{mathrm{H}2})$</tex> is severely reduced with respect to the SRS-free case <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$(delta_{mathrm{H}2} < delta_{max})$</tex> . Recently, it has been shown that an intracavity electro-optics phase modulator (EOM) can red and blue shift the CS spectrum [8]. In this work, we propose and demonstrate experimentally that an intracavity EOM can be leveraged to cancel the spectral red-shift caused by the SRS to overcome the fundamental limitation it imposes. The simplified experimental setup is depicted in Fig. 1b. It consists of a fiber ring resonator incorporating an EOM driven by a cosine waveform of amplitude <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$J=0.6$</tex> rad and frequency <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$Omegasimeq 2pitimes 9.3 text{GHz}$</tex> , an integer multiple of the cavity free-spectral-range. It also includes a short piece of erbium-doped fiber whose gain compensates for the EOM insertion loss [6]. The resonator is driven by 700 ps-long flat-top pulses <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$(P_{in}=100 text{mW})$</tex> synchronized with the FSR. Given the experimental parameters, we find <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$delta_{max}=4.6$</tex> rad (see Fig. 1a), at which CSs have a full width at half maximum duration of 730 fs [2]. Likewise, <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$delta_{mathrm{H}2}=2.8$</tex> rad [4], corresponding to a 990 fs-long soliton. The corresponding CS peak power evolution with the cavity detuning is given in Fig. 1a (black curve). It clearly suggests the ability to reach a detuning <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$(delta_{text{EOM}}simeq 4.2 text{rad})$</tex> close to the maximum value ( <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$delta_{max}$</tex> , set by <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$P_{in}$</tex> ), and clearly larger than the limit imposed by the SRS. Here, this limit coincides with the detuning for which the SRS red-shift equals the maximum blue-shift induced by the intracavity EOM <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>$(Delta omega=JvarOmega)$</tex> ." @default.
• W4386427861 created "2023-09-05" @default.
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• W4386427861 date "2023-06-26" @default.
• W4386427861 modified "2023-09-30" @default.
• W4386427861 title "Cavity Soliton Raman Self-Frequency Shift Cancellation" @default.
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• W4386427861 doi "https://doi.org/10.1109/cleo/europe-eqec57999.2023.10231987" @default.
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