Journal
OPTICS EXPRESS
Volume 18, Issue 25, Pages 26123-26140Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.026123
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Funding
- Earth Observation and Atmospheric Science Division of the Space Science and Technology Department of the STFC Rutherford Appleton Laboratory
- MIRTHE National Science Foundation (NSF) Engineering Research Center
- NSF [CMMI-0954897]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0954897] Funding Source: National Science Foundation
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A spectroscopic method of molecular detection based on dispersion measurements using a frequency-chirped laser source is presented. An infrared quantum cascade laser emitting around 1912 cm. 1 is used as a tunable spectroscopic source to measure dispersion that occurs in the vicinity of molecular ro-vibrational transitions. The sample under study is a mixture of nitric oxide in dry nitrogen. Two experimental configurations based on a coherent detection scheme are investigated and discussed. The theoretical models, which describe the observed spectral signals, are developed and verified experimentally. The method is particularly relevant to optical sensing based on mid-infrared quantum cascade lasers as the high chirp rates available with those sources can significantly enhance the magnitude of the measured dispersion signals. The method relies on heterodyne beatnote frequency measurements and shows high immunity to variations in the optical power received by the photodetector. (C) 2010 Optical Society of America
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