# Frequency comb generation threshold via second-harmonic excitation in χ(2) optical microresonators

@article{Szabados2020FrequencyCG,
title={Frequency comb generation threshold via second-harmonic excitation in $\chi$(2) optical microresonators},
author={Jan Szabados and Boris Sturman and Ingo Breunig},
journal={arXiv: Optics},
year={2020}
}
• Published 10 July 2020
• Physics
• arXiv: Optics
We investigate the threshold of $\chi^{(2)}$ frequency comb generation in lithium niobate whispering gallery microresonators theoretically and experimentally. When generating a frequency comb via second-harmonic generation, the threshold for the onset of cascaded second-order processes leading to a comb is found to be approximately 85 $\mu$W. The second-harmonic generation efficiency up to this value is in excellent agreement with a previously known theoretical framework. This framework is…
12 Citations

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## References

SHOWING 1-10 OF 41 REFERENCES

• Physics
Physical review letters
• 2020
The first such comb that is based on a millimeter-sized microresonator made of lithium niobate, that allows for cascaded second-order nonlinearities is presented, and the observed combs correspond to Turing roll patterns.
• Physics
Optics letters
• 2020
It is found that a wide range of different sideband frequency shifts can be generated by varying the experimental parameters under conditions where second-harmonic generation is close to natural phase matching.
• Physics
Optics express
• 2020
This work predicts walk-off controlled highly stable comb generation, which is drastically different from that known in the χ(3) case.
• Physics
CLEO 2015
• 2015
We experimentally demonstrate and theoretically explain the onset of optical frequency combs in a simple cavity-enhanced second-harmonic-generation system, exploiting second-order nonlinear
• Physics
2020 Conference on Lasers and Electro-Optics (CLEO)
• 2020
By significantly reducing waveguide loss, ultra-low-threshold Kerr comb generation is demonstrated in a high- Q AlGaAs-on-insulator microresonator system.
• Physics
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC
• 2013
The generation of optical Kerr frequency combs by microresonators has attracted much interest in the last few years [1]. The equidistant and highly resolved spectral lines of these combs are expected
• Physics
Physical review letters
• 2018
It is demonstrated that optical frequency combs can be generated in the parametric region around half of the pump frequency in a continuously driven OPO, and the analysis of the coherence properties of the simulated spectra shows the existence of correlated and phase-locked combs.
• Physics
Nature
• 2007
This work reports a substantially different approach to comb generation, in which equally spaced frequency markers are produced by the interaction between a continuous-wave pump laser of a known frequency with the modes of a monolithic ultra-high-Q microresonator via the Kerr nonlinearity.
• Physics
Optics letters
• 2013
Optical frequency comb generation by a continuous-wave pumped optical parametric oscillator (OPO) without any active modulation is reported, leading to spectral broadening of the OPO signal beam via self-phase modulation.
• Physics
CLEO 2012
• 2012
Mid and near-IR optical frequency combs generation in ultra high Q crystalline and integrated SiN microcavities is presented. Moreover, universal dynamics that influences phase noise is described.