Infrared cavity ringdown and integrated cavity output spectroscopy for trace species monitoring

Joshua B. Paul; James J. Scherer; Anthony O'Keefe; Larry Lapson; Janelle R. Anderson; Claire F. Gmachl; Federico Capasso; Alfred Y. Cho

doi:10.1117/12.455722

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22 February 2002 Infrared cavity ringdown and integrated cavity output spectroscopy for trace species monitoring

Joshua B. Paul, James J. Scherer, Anthony O'Keefe, Larry Lapson, Janelle R. Anderson, Claire F. Gmachl, Federico Capasso, Alfred Y. Cho

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Proceedings Volume 4577, Vibrational Spectroscopy-based Sensor Systems; (2002) https://doi.org/10.1117/12.455722
Event: Environmental and Industrial Sensing, 2001, Boston, MA, United States

Abstract

Although the ability of high finesse optical cavities to provide effective absorption path-lengths exceeding 10 km. has been known for quite some time, attempts to utilize this property for the purposes of high-resolution spectroscopy have often resulted in extremely complex experimental systems. Here, we demonstrate how off-axis optical paths through such cavities can be employed to produce relatively simple spectrometers capable of ultrasensitive absorption measurements. A proof-of-concept study using visible diode lasers has achieved a normalized absorption sensitivity of 1.8*10-10 cm^-1Hz^-1/2. Additionally, quantum cascade lasers have been employed to extend this method into the mid-infrared region, where sensitivities of 1.2*10-9 cm^-1Hz^-1/2 have been obtained.

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Joshua B. Paul, James J. Scherer, Anthony O'Keefe, Larry Lapson, Janelle R. Anderson, Claire F. Gmachl, Federico Capasso, and Alfred Y. Cho "Infrared cavity ringdown and integrated cavity output spectroscopy for trace species monitoring", Proc. SPIE 4577, Vibrational Spectroscopy-based Sensor Systems, (22 February 2002); https://doi.org/10.1117/12.455722

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