Journal
OPTICS EXPRESS
Volume 27, Issue 5, Pages 6106-6115Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.006106
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Funding
- National Key R&D Program of China [2017YFF0206102]
- Chinese Academy of Science [XDB21020100]
- National Natural Science Foundation of China [91736101,21688102,91436209,21427804]
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Noise-immune cavity enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is extremely sensitive in detecting weak absorption. However, the use of NICE-OHMS for metrology study was also hindered by its sensitivity to influence from various experimental conditions such as the residual amplitude modulation. Here we demonstrate to use NICE-OHMS for precision measurements of Lamb-dip spectra of molecules. After a dedicated investigation of the systematic uncertainties in the NICE-OHMS measurement, the transition frequency of a ro-vibrational line of C2H2 near 789 nm was determined to be 379 639 280 915.3 +/- 1.2 kHz (fractional uncertainty 3.2 x 10(12)), agreeing well with, but more accurate than, the value determined from previous cavity ring-down spectroscopy measurements. The study indicates the possibility to implement the very sensitive NICE-OHMS method for frequency metrology of molecules, or a molecular clock, in the near-infrared. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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