Dual-comb spectroscopy using plasmon-enhanced-waveguide dispersion-compensated quantum cascade lasers

Jonas Westberg, Lukasz A. Sterczewski, Filippos Kapsalidis, Yves Bidaux, Johanna M. Wolf, Mattias Beck, Jérôme Faist, Gerard Wysocki

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


In this Letter, we report on sub-millisecond response time mid-infrared dual-comb spectroscopy using a balanced asymmetric (dispersive) dual-comb setup with a matched pair of plasmon-enhanced-waveguide dispersion-compensated quantum cascade lasers. The system performance is demonstrated by measuring spectra of Bromomethane (CH3Br) and Freon 134a (CH2FCF3) at approximately 7.8 μm. A purely computational phase and timing-correction procedure is used to validate the coherence of the quantum cascade lasers frequency combs and to enable coherent averaging over the time scales investigated. The system achieves a noise-equivalent absorption better than 1 × 10−3 Hz−12, with a resolution of 9.8 GHz (0.326 cm−1) and an optical bandwidth of 1 THz (32 cm−1), with an average optical power of more than 1 mW per spectral element.

Original languageEnglish (US)
Pages (from-to)4522-4525
Number of pages4
JournalOptics Letters
Issue number18
StatePublished - Sep 15 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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