Mid-infrared frequency combs and staggered spectral patterns in $\chi^{(2)}$ microresonators
Abstract
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 present a new approach for the generation of mid-IR microcombs through cascaded three-wave-mixing. By pumping a CdSiP microresonator at 1.55 m wavelength with a low power continuous wave laser, we generate frequency combs at 3.1 m 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.
Cite
@article{arxiv.2205.12776,
title = {Mid-infrared frequency combs and staggered spectral patterns in $\chi^{(2)}$ microresonators},
author = {Nicolas Amiune and Zhiwei Fan and Vladislav V. Pankratov and Danila N. Puzyrev and Dmitry V. Skryabin and Kevin T. Zawilski and Peter G. Schunemann and Ingo Breunig},
journal= {arXiv preprint arXiv:2205.12776},
year = {2023}
}