Abstract

We report on a molecular clock based on the interrogation of the 3ν rotational-vibrational combination band at 1563 nm of carbon monoxide ${}^{12}{\mathrm{C}}^{16}\mathrm{O}$. The laser stabilization scheme is based on the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) technique in frequency modulation (FM) saturation spectroscopy. We use a high-finesse ultra-low expansion (ULE) glass optical cavity with CO as the molecular reference for long-term stabilization of the cavity resonance. We report an Allan deviation of $1.8\times {10}^{-12}$ at 1 s that improves to $\sim 3.5\times {10}^{-14}$ with 1000 s of averaging.

© 2016 Optical Society of America

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