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While mid-infrared radiation can be used to identify and quantify numerouschemical species, contemporary broadband mid-IR spectroscopic systems are oftenhindered by large footprints, moving parts and high power consumption. In thiswork, we demonstrate multiheterodyne spectroscopy using interband cascadelasers, which combines broadband spectral coverage with high spectralresolution and energy-efficient operation. The lasers generate up to 30 mW ofcontinuous wave optical power while consuming less than 0.5 W of electricalpower. A computational phase and timing correction algorithm is used to obtainkHz linewidths of the multiheterodyne beat notes and up to 30 dB improvement insignal-to-noise ratio. The versatility of the multiheterodyne technique isdemonstrated by performing both rapidly swept absorption and dispersionspectroscopic assessments of low-pressure ethylene (C$_2$H$_4$) acquired byextracting a single beat note from the multiheterodyne signal, as well asbroadband multiheterodyne spectroscopy of methane (CH$_4$) acquired with allavailable beat notes with microsecond temporal resolution and an instantaneousoptical bandwidth of 240 GHz. The technology shows excellent potential forportable and high-resolution solid state spectroscopic chemical sensorsoperating in the mid-infrared.

Multiheterodyne spectroscopy using interband cascade lasers