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Opt Express. 2021 Nov 22;29(24):39449-39460. doi: 10.1364/OE.443661.

Frequency-based dispersion Lamb-dip spectroscopy in a high finesse optical cavity.

Optics express

Katarzyna Bielska, Agata Cygan, Magdalena Konefał, Grzegorz Kowzan, Mikołaj Zaborowski, Dominik Charczun, Szymon Wójtewicz, Piotr Wcisło, Piotr Masłowski, Roman Ciuryło, Daniel Lisak

PMID: 34809309 DOI: 10.1364/OE.443661

Abstract

Frequency-based cavity mode-dispersion spectroscopy (CMDS), previously applied for Doppler-limited molecular spectroscopy, is now employed for the first time for saturation spectroscopy. Comparison with two intensity-based, cavity-enhanced absorption spectroscopy techniques, i.e. cavity mode-width spectroscopy (CMWS) and the well-established cavity ring-down spectroscopy (CRDS), shows the predominance of the CMDS. The method enables measurements in broader pressure range and shows high immunity of the Lamb dip position to the incomplete model of saturated cavity mode shape. Frequencies of transitions from the second overtone of CO are determined with standard uncertainty below 500 Hz which corresponds to relative uncertainty below 3 × 10

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