Cavity ringdown spectroscopy using mid-infrared quantum-cascade lasers
Publication information:
BA Paldus, CC Harb, TG Spence, RN Zare, Gmachl, Capasso, DL Sivco, JN Baillargeon, AL Hutchinson, and AY Cho. 2000. “Cavity Ringdown Spectroscopy Using Mid-Infrared Quantum-Cascade Lasers”. OPTICS LETTERS, 25, 9, Pp. 666-68. doi:10.1364/OL.25.000666
Abstract
Cavity ringdown spectra of ammonia at 10 parts in 10(9) by volume (ppbv) and higher concentrations were recorded by use of a 16-mW continuous-wave quantum-casacde distributed-feedback laser at 8.5 mu m whose wavelength was continuously temperature tuned over 15 nm. A sensitivity (noise-equivalent absorbance) of 3.4 x 10(-9) cm(-1) Hz(-1/2) was achieved for ammonia in nitrogen at standard temperature and pressure, which corresponds to a detection limit of 0.25 ppbv. (C) 2000 Optical Society of America.