Absolute frequency measurement of rubidium 5S-6P transitions
Phys. Rev. A, vol. 102, no. 1, pp. 012804 (2020).
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We report on measurements of the 5S-6P rubidium transition frequencies for rubidium isotopes with an absolute uncertainty of ≤ 20 kHz for the 5S → 6P3/2 transition and better than 20 MHz for the 5S → 6P1/2 transition, achieved by saturated absorption spectroscopy. From the results we derive the hyperfine splitting with an accuracy of 30 kHz and 450 kHz, respectively. This is an improvement of two orders of magnitude for the 5S → 6P3/2 transition to the current state of the art. We also verify the literature values for the 5S → 6P1/2 transition, the isotope shifts, as well as the magnetic dipole constants and the electric quadrupole constants.
1 Center for Quantum Science, Physikalisches Institut, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany
2 HighFinesse GmbH, Wöhrdstraße 4, 72072 Tübingen, Germany
3 Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
4 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany