Frequency comb generation via cascaded second-order nonlinearities in microresonators

Abstract

Optical frequency combs are revolutionising modern time and frequency metrology. In the past years, their range of applications has increased substantially, driven by their miniaturisation through microresonator-based solutions. The combs in such devices are typically generated using the third-order ${\chi }^{(3)}$-nonlinearity of the resonator material. An alternative approach is making use of second-order ${\chi }^{(2)}$-nonlinearities. While the idea of generating combs this way has been around for almost two decades, so far only few demonstrations are known, based either on bulky bow-tie cavities or on relatively low-$Q$ waveguide resonators. Here, we present the first such comb that is based on a millimetre-sized microresonator made of lithium niobate, that allows for cascaded second-order nonlinearities. This proof-of-concept device comes already with pump thresholds as small as 2 mW, generating repetition-rate-locked combs around 1064 nm and 532 nm. From the nonlinear dynamics point of view, the observed combs correspond to the Turing roll patterns.

arXiv commentArticle with supplementary information, 12 pages, 8 figures. V2 contains few missing umlauts

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Cited by in corpus (24)

• Pockels Soliton Microcomb
• Ultra-Broadband Kerr Microcomb Through Soliton Spectral Translation
• Broadband highly efficient nonlinear optical processes in on-chip integrated lithium niobate microdisk resonators of Q-factor above 10^8
• Excite atom-photon bound state inside the coupled-resonator waveguide coupled with a giant atom
• Optical frequency combs in quadratically nonlinear resonators
• Two-colour dissipative solitons and breathers in microresonator second-harmonic generation
• Frequency comb generation threshold in ${\chi }^{(2)}$ optical microresonators
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• Electro-optically tunable single-frequency lasing from neodymium-doped lithium niobate microresonators
• Reversible Self-Replication of Spatio-Temporal Kerr Cavity Patterns
• An ultra-stable microresonator-based electro-optic dual frequency comb
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• All-Optical Domain Inversion in LiNbO3 Crystals by Visible Continuous-Wave Laser Irradiation
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• Deterministic generation of parametrically driven dissipative Kerr soliton