SENSITIVE ABSORPTION-SPECTROSCOPY WITH A ROOM-TEMPERATURE DISTRIBUTED-FEEDBACK QUANTUM-CASCADE LASER

Authors
NAMJOU K CAI S WHITTAKER EA FAIST J GMACHL C CAPASSO F SIVCO DL CHO AY
Citation
K. Namjou et al., SENSITIVE ABSORPTION-SPECTROSCOPY WITH A ROOM-TEMPERATURE DISTRIBUTED-FEEDBACK QUANTUM-CASCADE LASER, Optics letters, 23(3), 1998, pp. 219-221
Citations number
14
Categorie Soggetti
Optics
Journal title
Optics letters → ACNP
ISSN journal
01469592
Volume
23
Issue
3
Year of publication
1998
Pages
219 - 221
Database
ISI
SICI code
0146-9592(1998)23:3<219:SAWARD>2.0.ZU;2-2
Abstract
We report what we believe are the first spectroscopic measurements to be made with a room-temperature quantum-cascade distributed-feedback l aser. Using wavelength modulation spectroscopy, we detected N2O and CH 4 in the chemical fingerprint wavelength range near 8 mu m. The noise equivalent absorbance for our measurement was 5 parts in 10(5), limite d by excess amplitude modulation on the laser output, which correspond s to a 1-Hz bandwidth detection limit of 250 parts N2O in 10(9) parts N-2 in a 1-m path length. (C) 1998 Optical Society of America.