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 N<sub>2</sub>O and CH<sub>4</sub> in the chemical fingerprint wavelength range near 8µm . The noise equivalent absorbance for our measurement was 5 parts in 10<sup>5</sup>, limited by excess amplitude modulation on the laser output, which corresponds to a 1-Hz bandwidth detection limit of 250 parts N<sub>2</sub>O in 10<sup>9</sup> parts N<sub>2</sub> in a 1-m path length.

© 1998 Optical Society of America

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