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Special Section on Quantum and Interband Cascade Lasers

Applications of midinfrared quantum cascade lasers to spectroscopy

[+] Author Affiliations
Gus Hancock

The University of Oxford, Department of Chemistry, The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, United Kingdom

Grant Ritchie

The University of Oxford, Department of Chemistry, The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, United Kingdom

Jean-Pierre van Helden

The University of Oxford, Department of Chemistry, The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, United Kingdom

Richard Walker

The University of Oxford, Department of Chemistry, The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, United Kingdom

Damien Weidmann

The University of Oxford, Department of Chemistry, The Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford, OX1 3QZ, United Kingdom and STFC Rutherford Appleton Laboratory, Space Science & Technology Department, Harwell Science and Innovation Campus, Didcot, OX11 0QX, United Kingdom

Opt. Eng. 49(11), 111121 (November 22, 2010). doi:10.1117/1.3498770
History: Received April 14, 2010; Revised June 23, 2010; Accepted June 24, 2010; Published November 22, 2010; Online November 22, 2010
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We review the use of both pulsed and continuous wave quantum cascade lasers in high-resolution spectroscopic studies of gas phase species. In particular, the application of pulsed systems for probing kinetic processes and the inherent rapid passage structure that accompanies observations of low-pressure samples using these rapidly chirped devices are highlighted. Broadband absorber spectroscopy and time-resolved concentration measurements of short-lived species, respectively exploiting the wide intrapulse tuning range and the pulse temporal resolution, are also mentioned. For comparison, we also present recent sub-Doppler Lamb-dip measurements on a low-pressure sample of NO, using a continuous wave external cavity quantum cascade laser system. Using this methodology the stability and resolution of this source is quantified. We find that the laser linewidth as measured via the Lamb-dip is ca. 2.7 MHz as the laser is tuned at comparably slow rates, but decreases to 1.3 MHz as the laser scan rate is increased such that the transition is observed at 30 kHz. Using this source, wavelength modulation spectroscopy of NO is presented.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Gus Hancock ; Grant Ritchie ; Jean-Pierre van Helden ; Richard Walker and Damien Weidmann
"Applications of midinfrared quantum cascade lasers to spectroscopy", Opt. Eng. 49(11), 111121 (November 22, 2010). ; http://dx.doi.org/10.1117/1.3498770


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