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arXiv · 1908.00871

Nanophotonic supercontinuum based mid-infrared dual-comb spectroscopy

Hairun Guo·Wenle Weng·Junqiu Liu·Fan Yang·Wolfgang Hansel·Camille Sophie Bres·Luc Thevenaz·Ronald Holzwarth·Tobias J. Kippenberg
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Abstract

High resolution and fast detection of molecular vibrational absorption is important for organic synthesis, pharmaceutical process and environmental monitoring, and is enabled by mid-infrared (mid-IR) laser frequency combs via dual-comb spectroscopy. Here, we demonstrate a novel and highly simplified approach to broadband mid-IR dual-comb spectroscopy via supercontinuum generation, achieved using unprecedented nanophotonic dispersion engineering that allows for flat-envelope, ultra-broadband mid-IR comb spectra. The mid-IR dual-comb has an instantaneous bandwidth covering the functional group region from 2800-3600 1/cm, comprising more than 100,000 comb lines, enabling parallel gas-phase detection with a high sensitivity, spectral resolution, and speed. In addition to the traditional functional groups, their isotopologues are also resolved in the supercontinuum based dual-comb spectroscopy. Our approach combines well established fiber laser combs, digital coherent data averaging, and integrated nonlinear photonics, each in itself a state-of-the-art technology, signalling the emergence of mid-IR dual-comb spectroscopy for use outside of the protected laboratory environment.

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Hairun Guo, Wenle Weng, Junqiu Liu, Fan Yang, Wolfgang Hansel, Camille Sophie Bres, Luc Thevenaz, Ronald Holzwarth, Tobias J. Kippenberg. 2019-08-02. Nanophotonic supercontinuum based mid-infrared dual-comb spectroscopy. https://doi.org/10.1364/optica.396542

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