Optical absorption spectrometry using laser amplitude modulation

Jong H. Chow, Andrew R. Wade, Conor Mow-Lowry, David S. Rabeling, Ian C.M. Littler, David E. McClelland, Malcolm B. Gray

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    We present a new technique for cavity enhanced optical absorption spectrometry, employing a radio-frequency amplitude modulated laser to interrogate an optical cavity. It is capable of sensing molecular absorption at the fundamental laser shot noise limit, and is able to perform quantum noise limited gas sensing at atmospheric pressure. We implement this technique, for the first time, in a free space cavity, and demonstrate that the demodulated error signal can be used to measure losses in a resonator.

    Original languageEnglish
    Title of host publicationIEEE Sensors 2009 Conference - SENSORS 2009
    Pages1979-1983
    Number of pages5
    DOIs
    Publication statusPublished - 2009
    EventIEEE Sensors 2009 Conference - SENSORS 2009 - Christchurch, New Zealand
    Duration: 25 Oct 200928 Oct 2009

    Publication series

    NameProceedings of IEEE Sensors

    Conference

    ConferenceIEEE Sensors 2009 Conference - SENSORS 2009
    Country/TerritoryNew Zealand
    CityChristchurch
    Period25/10/0928/10/09

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