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

doi:10.1364/OL.23.000219

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

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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 language	English
Pages (from-to)	219-223
Number of pages	5
Journal	Optics Letters
Volume	23
Issue number	3
DOIs	https://doi.org/10.1364/OL.23.000219
State	Published - 1 Feb 1998

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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.",

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AU - Namjou, K.

AU - Cai, S.

AU - Whittaker, E. A.

AU - Faist, J.

AU - Gmachl, C.

AU - Capasso, F.

AU - Sivco, D. L.

AU - Cho, A. Y.

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N2 - 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.

AB - 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.

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JO - Optics Letters

JF - Optics Letters

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

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