Multiple soliton regimes enabled by parametric down-conversion in χ(2)+χ(3) microresonators
Abstract
Half-harmonic generation in microresonators with mixed χ(2) and χ(3) nonlinearities provides access to a rich landscape of two-colour soliton states and frequency combs. We numerically demonstrate the formation of both bright and topological two-colour solitons at relatively modest pump powers and phase-mismatch parameters. At higher powers and larger phase mismatches, we identify a regime where parametric down-conversion assists the formation of dark solitons in the normally dispersive pump field. While the dark-soliton core is primarily shaped by the Kerr nonlinearity, nonlinear coupling between the pump and its half-harmonic modes enables soliton excitation using a standard laser-frequency scanning technique, a capability not normally associated with dark solitons. The simulations are performed using parameters representative of lithium-niobate microresonators pumped near 775 nm and generating a half-harmonic near 1550 nm. These results reveal how the interplay of χ(2) and χ(3) nonlinearities can substantially expand the range and types of experimentally accessible soliton states in a single integrated frequency-comb platform.
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BibTeX
@misc{talenti2026multiple,
title = {{Multiple soliton regimes enabled by parametric down-conversion in $χ^(2)+χ^(3)$ microresonators}},
author = {Francesco Rinaldo Talenti and Tommi Isoniemi and Jonathan Silver and Dmitry Skryabin},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.17706},
eprint = {2607.17706},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.17706},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Multiple soliton regimes enabled by parametric down-conversion in χ^(2)+χ^(3) microresonators
AU - Francesco Rinaldo Talenti
AU - Tommi Isoniemi
AU - Jonathan Silver
AU - Dmitry Skryabin
PY - 2026
DA - 2026/09/07
PB - arXiv
DO - 10.48550/arxiv.2607.17706
UR - https://arxiv.org/abs/2607.17706
AB - Half-harmonic generation in microresonators with mixed χ^(2) and χ^(3) nonlinearities provides access to a rich landscape of two-colour soliton states and frequency combs. We numerically demonstrate the formation of both bright and topological two-colour solitons at relatively modest pump powers and phase-mismatch parameters. At higher powers and larger phase mismatches, we identify a regime where parametric down-conversion assists the formation of dark solitons in the normally dispersive pump field. While the dark-soliton core is primarily shaped by the Kerr nonlinearity, nonlinear coupling between the pump and its half-harmonic modes enables soliton excitation using a standard laser-frequency scanning technique, a capability not normally associated with dark solitons. The simulations are performed using parameters representative of lithium-niobate microresonators pumped near 775 nm and generating a half-harmonic near 1550 nm. These results reveal how the interplay of χ^(2) and χ^(3) nonlinearities can substantially expand the range and types of experimentally accessible soliton states in a single integrated frequency-comb platform.
ER -