Continuous-wave stimulated Raman gain spectroscopy with cavity-ringdown detection

Florian V. Englich, Yabai He, Brian J. Orr

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution


    We have extended cavity ringdown spectroscopy from its conventional optical-absorption mode of operation into the regime of coherent Raman spectroscopy. Continuous-wave stimulated Raman gain spectra of the ν₁ rovibrational fundamental Raman band of methane gas at 2916.5-cm⁻¹ are measured, using tunable cw laser light at ~1544 nm to probe ringdown decay from a rapidly-swept optical cavity that is itself inside the cavity of a cw single-longitudinal-mode Nd:YAG ring laser operating at ~1064.5 nm. Recent progress on this project has substantially improved the previously reported noise-equivalent sensitivity, with a second ringdown cavity facilitating subtraction of troublesome infraredabsorption background signals. Moreover, by using a ringdown cavity in the form of a ring, the pump and ringdowndetected Stokes beams are able to co-propagate unidirectionally; this substantially reduces Doppler broadening.
    Original languageEnglish
    Title of host publicationProceedings of the 17th Australian Institute of Physics national congress 2006
    EditorsJohn Dobson, Robert Sang
    PublisherAustralian Institute of Physics
    Number of pages4
    ISBN (Print)0959806474
    Publication statusPublished - 2006
    EventAustralian Institute of Physics National Congress (17th : 2006) - Brisbane
    Duration: 3 Dec 20068 Dec 2006


    ConferenceAustralian Institute of Physics National Congress (17th : 2006)


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