Abstract
A direct-absorption spectrometer, based on a pulsed, distributed feedback, quantum cascade laser with a 10.26-μ m wavelength and an astigmatic Herriott cell with a 66-m path length, has been developed for high-resolution IR spectroscopy. This spectrometer utilizes the intrapulse method, an example of sweep integration, in which the almost linear wavelength up-chirp obtained from a distributed feedback, quantum cascade laser yields a spectral microwindow of as many as 2.5 wave numbers/cm(-1). Within this spectral microwindow, molecular fingerprints can be monitored and recorded in real time. This system allows both the detection of carbon dioxide and ethylene and the real-time observation of the evolution of these gases in the exhaust by-products from several cars. © 2005 Optical Society of America.
Original language | English |
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Pages (from-to) | 2887-2894 |
Number of pages | 8 |
Journal | Applied Optics |
Volume | 44 |
Issue number | 14 |
DOIs | |
Publication status | Published - 10 May 2005 |
Keywords
- quantum-cascade laser
- cigarette smoke
- spectroscopy
- cells
- spectrometer