Single mode, distributed feedback interband cascade lasers grown on Si for gas sensing

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Abstract
A single mode distributed feedback (DFB) interband cascade laser (ICL) grown on a (001) Si substrate has been developed. The designed DFB ICL with a grating on top of the ridge emits at a wavelength near 3.4 μm, suited for methane gas sensing, and operates in continuous wave up to 35 °C, with a maximum output power of 4 mW/facet at 15 °C and a side mode suppression ratio of 20 dB in the whole operating range. Methane detection has been demonstrated by integrating the DFB ICL on Si with a quartz-enhanced photoacoustic spectroscopy setup, a step forward in the development of integrated photonic gas sensors on silicon platforms.
Funding Information
  • Agence Nationale de la Recherche (ANR-11-EQPX0016)
  • Agence Nationale de la Recherche (ANR-21-ESRE-0026)
  • Bpifrance (DOS0188007/00)
  • Région Occitanie Pyrénées-Méditerranée (LASIDO)
  • the French Agency for Defense and Innovation

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