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Mid-IR Tunable Lasers Probe Hydrocarbon Molecules

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Angus Henderson, Lockheed Martin Aculight

Infrared laser spectroscopy is a powerful technique that allows unique identification of chemical species as well as study of their properties. Measuring absorption as a function of wavelength enables chemists to obtain spectra of compounds that are a unique reflection of their molecular structure. The wavelength region between 3.0 and 3.7 μm (2750 cm−1 and 3300 cm−1 in frequency) is particularly important because it contains virtually all the characteristic stretching frequencies of molecules containing carbon-hydrogen bonds. The strength of the fundamental absorptions in...Read full article

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    Published: September 2009
    Glossary
    chemical vapor deposition
    Chemical vapor deposition is a process of applying dopants to a glass bait by flame reactions of gaseous compounds. See also outside vapor-phase oxidation; inside vapor-phase oxidation.
    color center laser
    Certain color centers in the alkali halides have been optically pumped to produce efficient tunable pulsed and continuous-wave (CW) lasers emitting in the range of 0.8 to 3.3 µm.
    dye laser
    A laser using a dye solution as its active medium. Its output is a short pulse of broad spectral content and its achievable gain is high. Dye lasers function at room temperature. Synchronous pumping can be used to produce a continuous train of tunable picosecond pulses for sustained periods.
    photoacoustic spectroscopy
    A method for obtaining the optical absorption spectra of solids, semisolids, liquids and gases. PAS is inherently insensitive to reflection or scattering from the sample, analyzes opaque samples and can measure spectra below the sample surface.
    alkali halidealkali oxideAngus HendersonArgosBasic ScienceC-H stretchcarbon-hydrogen bondscatalytic conversioncavity ringdown spectroscopychemical vapor depositionchemistrycolor center lasercontinuous-wave OPOsCW OPOdiagnosticsdifference frequency generationdiode lasersDPSS lasersDye LaserÉcole Polytechnique Fédérale de Lausanneexternal cavity quantum cascade laserexternal-cavity diode laserFeaturesfeedback diode laserfiber lasersfingerprint regionFrans HarrenGary Douberlygreenhouse gas emissionsheliumheterogeneous catalysishydrocarbonindustrialinterband cascade laserkrypton ion laserLife Science Trace Gas FacilityLockheed Martin Aculightmethanemid-infraredmonotonic tuningnarrowband tunable lasernatural gasOPOsoptical parametric oscillatorsphotoacoustic spectroscopypump sourceRadboud UniversityRainer Becksemiconductor laserssemiconductor wafersemiconductorsSensors & Detectorssingly resonant oscillatorspectroscopySwitzerlandTest & Measurementtitanium-sapphire lasertrace gas detectorTunable LasersUniversity of Georgia in AthensLasers

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