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22 February 2002 Infrared cavity ringdown and integrated cavity output spectroscopy for trace species monitoring
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Proceedings Volume 4577, Vibrational Spectroscopy-based Sensor Systems; (2002)
Event: Environmental and Industrial Sensing, 2001, Boston, MA, United States
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.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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