Frequency Comb Generation via Cascaded Second-Order Nonlinearities in Microresonators

Jan Szabados, Danila N. Puzyrev, Yannick Minet, Luis Reis, Karsten Buse, Alberto Villois, Dmitry V. Skryabin, Ingo Breunig

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Optical frequency combs are revolutionizing modern time and frequency metrology. In the past years, their range of applications has increased substantially, driven by their miniaturization through microresonator-based solutions. The combs in such devices are typically generated using the third-order χ^{(3)} nonlinearity of the resonator material. An alternative approach is making use of second-order χ^{(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 millimeter-sized microresonator made of lithium niobate, that allows for cascaded second-order nonlinearities. This proof-of-concept device comes already with pump powers as low as 2 mW, generating repetition-rate-locked combs around 1064 and 532 nm. From the nonlinear dynamics point of view, the observed combs correspond to Turing roll patterns.

Original languageEnglish
Article number203902
Pages (from-to)203902
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 22 May 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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