Journal
OPTICS LETTERS
Volume 45, Issue 8, Pages 2195-2198Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.390086
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Funding
- European Research Council [ERC-2012-StG 306630-MATISSE, ERC-2017-CoG 771647-PISSARRO]
- SchweizerischerNationalfonds zur Forderung der Wissenschaftlichen Forschung [178895]
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Efficient third-order nonlinear optical processes have been successfully integrated on silicon nitride (Si3N4) wa ve guides. In particular, owing to Si3N4 wide transparency window spanning from the visible to the middle-infrared (mid-IR), efficient mid-IR dispersive-wave (DW) generation from a fiber laser has been recently demonstrated, and its potential as a source for absorption spectroscopy of a single gas has been established. Here we show that the system can be further engineered to broaden the coverage of a single DW without losing efficiency, as to enable simultaneous and discrete detection of several gas-phase molecules within the 2900 and 3380 cm(-1) functional group region. We demonstrate quantitative detection of acetylene, methane, and ethane using a simple direct-absorption spectroscopy scheme, achieving a several hundreds of parts-per-million noise-equivalent detection limit with a 5 cm long gas cell. (C) 2020 Optical Society of America
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