Cavity ringdown spectroscopy using mid-infrared quantum-cascade lasers

B. A. Paldus, C. C. Harb, T. G. Spence, R. N. Zare, Claire F. Gmachl, F. Capasso, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, A. Y. Cho

Research output: Contribution to journalArticlepeer-review

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Cavity ringdown spectra of ammonia at 10 parts in 109 by volume (ppbv) and higher concentrations were recorded by use of a 16-mW continuous-wave quantum-casacde distributed-feedback laser at 8.5 μm whose wavelength was continuously temperature tuned over 15 nm. A sensitivity (noise-equivalent absorbance) of 3.4 × 10-9 cm-1 Hz-1/2 was achieved for ammonia in nitrogen at standard temperature and pressure, which corresponds to a detection limit of 0.25 ppbv.

Original languageEnglish (US)
Pages (from-to)666-668
Number of pages3
JournalOptics Letters
Issue number9
StatePublished - May 1 2000

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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