Mid-infrared frequency combs and staggered spectral patterns in χ(2) microresonators

N. Amiune, Z. Fan, V. V. Pankratov, D. N. Puzyrev, D. V. Skryabin, K. T. Zawilski, P. G. Schunemann, I. Breunig

Research output: Contribution to journalArticlepeer-review


The potential of frequency comb spectroscopy has aroused great interest in generating mid-infrared frequency combs in the integrated photonic setting. However, despite remarkable progress in microresonators and quantum cascade lasers, the availability of suitable mid-IR comb sources remains scarce. Here, we generate mid-IR microcombs relying on cascaded three-wave-mixing for the first time. By pumping a CdSiP2 microresonator at 1.55 µm wavelength with a low power continuous wave laser, we generate χ(2) frequency combs at 3.1 µm wavelength, with a span of about 30 nm. We observe ordinary combs states with a line spacing of the free spectral range of the resonator, and combs where the sideband numbers around the pump and half-harmonic alternate, forming staggered patterns of spectral lines. Our scheme for mid-IR microcomb generation is compatible with integrated telecom lasers. Therefore, it has the potential to be used as a simple and fully integrated mid-IR comb source, relying on only one single material.

Original languageEnglish
Pages (from-to)907-915
Number of pages9
JournalOptics Express
Issue number2
Early online date3 Jan 2023
Publication statusPublished - 16 Jan 2023

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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