Reservoir spectroscopy of 5s5p ${}^3$P${}_2$ - 5s$n$d ${}^3$D${}_{1,2,3}$ transitions in strontium

Abstract

We perform spectroscopy on the optical dipole transitions 5s5p ${}^3$P${}_2$ - 5s$n$d ${}^3$D${}_{1,2,3}$, $n\in (5,6)$, for all stable isotopes of atomic strontium. We develop a new spectroscopy scheme, in which atoms in the metastable ${}^3$P${}_2$ state are stored in a reservoir before being probed. The method presented here increases the attained precision and accuracy by two orders of magnitude compared to similar experiments performed in a magneto-optical trap or discharge. We show how the state distribution and velocity spread of atoms in the reservoir can be tailored to increase the spectroscopy performance. The absolute transition frequencies are measured with an accuracy of 2 MHz. The isotope shifts are given to within 200 kHz. We calculate the $A$ and $Q$ parameters for the hyperfine structure of the fermionic isotope at the MHz-level. Furthermore, we investigate the branching ratios of the ${}^3$D${}_J$ states into the ${}^3$P${}_J$ states and discuss immediate implications on schemes of optical pumping and fluorescence detection.

15 pages, 7 figures, 4 tables

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• Progress towards a matter wave interferometer for inertial sensing with non-destructive monitoring of Bloch oscillations
• Universal gates for a metastable qubit in strontium-88
• Analyzing the optical pumping on the $5s4d{}^1{D}_2-5s8p{}^1{P}_1$ transition in a magneto-optical trap of Sr atoms
• Limitation of single-repumping schemes for laser cooling of Sr atoms
• Direct loading of a Sr magneto-optical trap from a thermal atomic beam
• Absolute frequency measurements on the $5s5p^3$P${}_0\to 5s6d^3$D${}_1$ transition in strontium
• Magic wavelength at 477 nm for the strontium clock transition
• Sub-Doppler cooling of bosonic strontium in a two-color MOT