4.6 Article

Spectroscopy of the 85Rb 4D3/2 state for hyperfine-structure determination

Journal

NEW JOURNAL OF PHYSICS
Volume 25, Issue 9, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1367-2630/acf405

Keywords

hyperfine structure; precision measurements; atomic clocks; laser spectroscopy; cold atoms

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We report measurements of the hyperfine-structure constants of the Rb-85 4D(3/2) state using two-photon optical spectroscopy. The spectra were obtained by measuring the transmission of a low-power laser beam through a cold-atom sample. The dominant systematic error was addressed by extrapolating line positions measured for different laser powers. The results provide valuable information for precision metrology, atom-based quantum technologies, and molecular physics.
We report a measurement of the hyperfine-structure constants of the Rb-85 4D(3/2) state using two-photon optical spectroscopy of the 5S(1/2) -> 4D(3/2) transition. The spectra are acquired by measuring the transmission of the low-power 795 nm lower-stage laser beam through a cold-atom sample as a function of laser frequency, with the frequency of the upper-stage, 1476 nm laser fixed. All 4 hyperfine components of the 4D(3/2) state are well-resolved in the experimental data. The dominant systematic is the light shift from the 1476 nm laser, which is addressed by extrapolating line positions measured for a set of 1476 nm laser powers to zero laser power. The analysis of our experimental data yields both the magnetic-dipole and electric-quadrupole constants for the (85)Rb4D(3/2) level, without using earlier hyperfine measurements of other atomic levels. The respective results, A =7.419(35) MHz and B =4.19(19) MHz, are discussed in context with previous works. Our investigation may be useful for optical atomic clocks for precision metrology and emerging atom-based quantum technologies, all-infrared excitation of Rb Rydberg levels, and molecular physics.

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