Optical heterodyne signal generation and detection in cavity ringdown spectroscopy based on a rapidly swept cavity

Yabai He*, Brian J. Orr

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    43 Citations (Scopus)

    Abstract

    A novel approach to cavity ringdown spectroscopy uses a continuous-wave laser and a rapidly swept optical cavity to shift the frequency of optical radiation stored in the cavity. This frequency-shifted radiation from the ringdown cavity is then combined with incident laser radiation to generate optical heterodyne signals, simply and efficiently. A noise-limited absorbance sensitivity of 3×10-9cm-1 is realised, using ~35 μW of single-mode radiation from a 1.53 μm tunable diode laser. The resonance properties of a swept optical cavity simplify this heterodyne-detected technique by avoiding the customary need for a fast optical switch or for wavelength-locking of cavity length.

    Original languageEnglish
    Pages (from-to)215-220
    Number of pages6
    JournalChemical Physics Letters
    Volume335
    Issue number3-4
    DOIs
    Publication statusPublished - 23 Feb 2001

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