Mid infrared gas spectroscopy using efficient fiber laser driven photonic chip-based supercontinuum

Davide Grassani (), Eirini Tagkoudi, Hairun Guo, Clemens Herkommer, Fan Yang, Tobias J. Kippenberg and Camille-Sophie Brès ()
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Davide Grassani: STI-IEL
Eirini Tagkoudi: STI-IEL
Hairun Guo: SB-IPHYS
Clemens Herkommer: SB-IPHYS
Fan Yang: STI-IEL
Tobias J. Kippenberg: SB-IPHYS
Camille-Sophie Brès: STI-IEL

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Directly accessing the middle infrared, the molecular functional group spectral region, via supercontinuum generation processes based on turn-key fiber lasers offers the undeniable advantage of simplicity and robustness. Recently, the assessment of the coherence of the mid-IR dispersive wave in silicon nitride (Si3N4) waveguides, pumped at telecom wavelength, established an important first step towards mid-IR frequency comb generation based on such compact systems. Yet, the spectral reach and efficiency still fall short for practical implementation. Here, we experimentally demonstrate that large cross-section Si3N4 waveguides pumped with 2 μm fs-fiber laser can reach the important spectroscopic spectral region in the 3–4 μm range, with up to 35% power conversion and milliwatt-level output powers. As a proof of principle, we use this source for detection of C2H2 by absorption spectroscopy. Such result makes these sources suitable candidate for compact, chip-integrated spectroscopic and sensing applications.

Date: 2019
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DOI: 10.1038/s41467-019-09590-3

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