Ringdown and cavity-enhanced absorption spectroscopy using a continuous-wave tunable diode laser and a rapidly swept optical cavity

Yabai He*, Brian J. Orr

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    79 Citations (Scopus)

    Abstract

    We use a rapidly swept optical cavity in a novel approach to cavity ringdown spectroscopy (CRDS) with a continuous-wave (cw) laser. This simplifies cw-CRDS by eliminating the need for a fast optical switch and is demonstrated by recording weak combination-band spectra of carbon dioxide diluted in nitrogen, using a cw single-mode tunable diode laser (TDL) in the 1.55 μm near-infrared region. We employ a simultaneous combination of CRDS and cavity-enhanced absorption spectroscopy, to compensate for nonlinear CRDS response that is observed for stronger absorption features. Experimental results and performance characteristics are presented, together with numerical simulations.

    Original languageEnglish
    Pages (from-to)131-137
    Number of pages7
    JournalChemical Physics Letters
    Volume319
    Issue number1-2
    Publication statusPublished - 10 Mar 2000

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