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 |
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Pages (from-to) | 219-223 |
Number of pages | 5 |
Journal | Optics Letters |
Volume | 23 |
Issue number | 3 |
DOIs | |
State | Published - 1 Feb 1998 |