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Article Dans Une Revue Communications Physics Année : 2023

Stimulated Raman scattering metrology of molecular hydrogen

Résumé

Frequency combs have revolutionized optical frequency metrology, allowing one to determine highly accurate transition frequencies of a wealth of molecular species. These progresses have only marginally benefited infrared-inactive transitions, due to their inherently weak cross-sections. Here we overcome this limitation by introducing stimulated-Raman-scattering metrology, where a frequency comb is exploited to calibrate the frequency detuning between the pump and Stokes excitation lasers. We apply this approach to the investigation of molecular hydrogen, which is a recognized benchmark for tests of quantum electrodynamics and of theories that describe physics beyond the standard model. Specifically, we measure the transition frequency of the Q(1) fundamental line of H-2 around 4155 cm(-1) with few parts-per-billion uncertainty, which is comparable to the theoretical benchmark of ab initio calculations and more than a decade better than the experimental state of the art. Our comb-calibrated stimulated Raman scattering spectrometer extends the toolkit of optical frequency metrology as it can be applied, with simple technical changes, to many other infrared-inactive transitions, over a 50-5000 cm(-1) range that covers also purely rotational bands. Molecular hydrogen has a simple structure that makes it a unique benchmark for molecular quantum physics. The authors determined the transition energy of its fundamental Q(1) vibrational line with an unprecedented parts-per-billion accuracy by a novel spectrometer that combines Stimulated-Raman-Scattering with comb calibration of optical frequencies.

Dates et versions

hal-04087369 , version 1 (03-05-2023)

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Marco Lamperti, Lucile Rutkowski, Daniele Ronchetti, Davide Gatti, Riccardo Gotti, et al.. Stimulated Raman scattering metrology of molecular hydrogen. Communications Physics, 2023, 6 (1), pp.67. ⟨10.1038/s42005-023-01187-z⟩. ⟨hal-04087369⟩
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