Electro-optic dual-comb spectroscopy for green house gas sensing - 2026_IDR_DFIS_19

The research program combines electro-optic comb technology and nonlinear optics to develop a robust dual comb-spectroscopy platform operating in the mid-IR for sensitive detection of multiple species of interest for net-zero targets. The platform will rely on a robust nonlinear laser source where two phase-coherent electro-optic frequency combs generated in a fully-fibered arrangement at ~1.55 μm will be down-converted in the mid-infrared through a difference-frequency generation process seeded with a widely tunable high-power optical parametric oscillator. The use of suitable orientation-patterned Gallium Arsenide with fan-out gratings will enable milliwatt power for the two combs and tunability across most part of the fingerprint region, from 3 to 11 m. Specifically, the research activity will concern: 1) the synthesis of dual electro-optic combs in the near-infrared with bandwidth by up to 60 GHz, using both a compact single-sideband modulator and a more standard approach based on