Optical-parametric-oscillation-based χ(2) frequency comb in a lithium niobate microresonator

N. Amiune, D. N. Puzyrev, V. V. Pankratov, D. V. Skryabin, K. Buse, I. Breunig

Research output: Contribution to journalArticlepeer-review

18 Citations (SciVal)


Microresonator frequency combs based on the χ(3) nonlinearity are nowadays well understood and making their way into different applications. Recently, microresonator frequency combs based on the χ(2) nonlinearity are receiving increasing attention, as they promise certain benefits, but still require further study. Here, we present the first indication of χ(2) frequency comb generation, initiated via optical parametric oscillation (OPO) in a lithium niobate mm-sized microresonator. By pumping at 532 nm with 300 µW of power, we observe 1-THz-wide comb spectra around 1064 nm with degenerate and non-degenerate states. We also show that comb generation requires signal and idler waves to be degenerate in mode numbers and how the fulfillment of this condition can be identified from the temperature tuning curves. The results demonstrate the potential to directly generate frequency combs via OPO beyond 3 µm wavelengths in the mid-IR by puming in the near-IR region.

Original languageEnglish
Pages (from-to)41378-41387
Number of pages10
JournalOptics Express
Issue number25
Early online date30 Nov 2021
Publication statusPublished - 6 Dec 2021

Bibliographical note

Funding Information:
Engineering and Physical Sciences Research Council (2119373); Horizon 2020 Framework Programme (812818). The authors thank H. Giessen (University of Stuttgart) and P. Del?Haye (MPI for the Science of Light) for support regarding experimental equipment.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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