@article { ISI:000165874300016,
	title = {Trace-gas detection in ambient air with a thermoelectrically cooled, pulsed quantum-cascade distributed feedback laser},
	journal = {APPLIED OPTICS},
	volume = {39},
	number = {36},
	year = {2000},
	month = {DEC 20},
	pages = {6866-6872},
	publisher = {OPTICAL SOC AMER},
	type = {Article},
	address = {2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA},
	abstract = {A pulsed quantum-cascade distributed feedback laser operating at near room temperature was used for sensitive high-resolution IR absorption spectroscopy of ambient air at a wavelength of similar to8 mum. Near-transform-limited laser pulses were obtained owing to short (similar to5-ns) current pulse excitation and optimized electrical coupling. Fast and slow computer-controlled frequency scanning techniques were implemented and characterized. Fast computer-controlled laser wavelength switching was used to acquire second-derivative absorption spectra. The minimum detectable absorption was found to be 3 x 10(-4) with 10(5) laser pulses (20-kHz repetition rate), and 1.7 x 10(-4) for 5 x 10(5) pulses, based on the standard deviation of the linear regression analysis. (C) 2000 Optical Society of America OCIS codes: 140.5960, 280.3420, 300.6320, 010.1280.},
	issn = {1559-128X},
	doi = {10.1364/AO.39.006866},
	author = {Kosterev, AA and Tittel, FK and C. Gmachl and F. Capasso and Sivco, DL and Baillargeon, JN and Hutchinson, AL and Cho, AY}
}
