Sensitive absorption spectroscopy with a room-temperature distributed-feedback quantum-cascade laser

K. Namjou, S. Cai, E. A. Whittaker, J. Faist, C. Gmachl, F. Capasso, D. L. Sivco, A. Y. Cho

Research output: Contribution to journalArticlepeer-review

265 Scopus citations

Abstract

We report what we believe are the first spectroscopic measurements to be made with a room-temperature quantum-cascade distributed-feedback laser. Using wavelength modulation spectroscopy, we detected N2O and CH4 in the chemical fingerprint wavelength range near 8 μm. The noise equivalent absorbance for our measurement was 5 parts in 105, limited by excess amplitude modulation on the laser output, which corresponds to a 1-Hz bandwidth detection limit of 250 parts N2O in 109 parts N2 in a 1-m path length.

Original languageEnglish (US)
Pages (from-to)219-223
Number of pages5
JournalOptics Letters
Volume23
Issue number3
DOIs
StatePublished - Feb 1 1998

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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