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12 May 2011Intracavity laser absorption spectroscopy using mid-IR quantum cascade laser
Intracavity Laser Absorption Spectroscopy (ICLAS) at IR wavelengths offers an opportunity for spectral sensing with
sufficient sensitivity to detect vapors of low vapor pressure compounds such as explosives. Reported here are key
enabling technologies for this approach, including multi-mode external-cavity quantum cascade lasers and a scanning
Fabry-Perot spectrometer to analyze the laser mode spectrum in the presence of a molecular intracavity absorber.
Reported also is the design of a compact integrated data acquisition and control system. Applications include military
and commercial sensing for threat compounds, chemical gases, biological aerosols, drugs, and banned or invasive plants
or animals, bio-medical breath analysis, and terrestrial or planetary atmosphere science.
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G. Medhi, A. V. Muravjov, H. Saxena, C. J. Fredricksen, T. Brusentsova, R. E. Peale, O. Edwards, "Intracavity laser absorption spectroscopy using mid-IR quantum cascade laser," Proc. SPIE 8032, Next-Generation Spectroscopic Technologies IV, 80320E (12 May 2011); https://doi.org/10.1117/12.883331