Pollutant emission monitoring using QC laser-based mid-IR sensors

D. M. Sonnenfroh, M. G. Allen, W. T. Rawlins, Claire F. Gmachl, F. Capasso, A. Hutchinson, D. Sivco, A. Y. Cho

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Recent advances in mid-IR semiconductor laser technology based on intersubband transitions in InGaAs quantum wells promise a dramatic impact on tunable diode laser-based sensors for trace gases. This paper reports recent progress toward this realization of room-temperature laser-based sensors for combustion-generated pollutants such as NOx and SOx. Laboratory measurements of SO2 at 8.6 μm are presented with detection limits on the order of 1 ppm. Extensions of these approaches for higher sensitivity measurements in exhaust gas conditions are described, as well as measurements of SO3.

Original languageEnglish (US)
Pages (from-to)86-97
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • Combustion sensor
  • Diode laser
  • Pollutant monitoring
  • Quantum cascade laser


Dive into the research topics of 'Pollutant emission monitoring using QC laser-based mid-IR sensors'. Together they form a unique fingerprint.

Cite this