This Frontiers article describes frequency-stabilized cavity ring-down spectroscopy (FS-CRDS), an ultraprecise refinement of conventional cw-CRDS. We review the technique and highlight some recent studies which have utilized FS-CRDS to perform precision measurements of molecular transitions in the near-infrared. We also describe significant system enhancements which we are currently implementing, including Pound-Drever-Hall locking and optical frequency comb-stabilization. These improvements have the potential to reduce the uncertainty in both the absorption and frequency axes of our spectra by more than an order of magnitude. Finally, high impact applications of this capability are described which can exploit frequency axis uncertainty at the 10 kHz level and signal-to-noise ratios exceeding 200,000:1.
Citation: Chemical Physics Letters
Pub Type: Journals
instrumentation, cavity ring-down spectroscopy, optical frequency comb, optical metrology