Effective utilization of quantum-cascade distributed-feedback lasers in absorption spectroscopy

Citation:

AA Kosterev, RF Curl, FK Tittel, C Gmachl, F Capasso, DL Sivco, JN Baillargeon, AL Hutchinson, and AY Cho. 2000. “Effective utilization of quantum-cascade distributed-feedback lasers in absorption spectroscopy.” APPLIED OPTICS, 39, 24, Pp. 4425-4430.

Abstract:

A variable duty cycle quasi-cw frequency scanning technique was applied to reduce thermal effects resulting from the high heat dissipation of type I quantum-cascade lasers. This technique was combined with a 100-m path-length multipass cell and a zero-air background-subtraction technique to enhance detection sensitivity to a parts-in-10(9) (ppb) concentration level for spectroscopic trace-gas detection of CH4, N2O, H2O, and C2H5OH in ambient air at 7.9 mu m. A new technique for analysis of dense high resolution absorption spectra was applied to detection of ethanol in ambient air, yielding a 125-ppb detection limit. (C) 2000 Optical Society of America OCIS codes: 140.5960, 280.3420, 300.6320, 010.1280.