Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 7: Precision spectroscopy of atoms and ions I

A 7.3: Talk

Monday, March 9, 2020, 14:45–15:00, f107

Two-Photon Shelving spectroscopy on a UV-transition in atomic Dysprosium — •Jan-Niklas Schmidt, Viraatt Anasuri, Fabian Böttcher, Kevin Ng, Mingyang Guo, Tim Langen, and Tilman Pfau — 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology IQST, Universität Stuttgart

Dysprosium features one of the largest magnetic moment in the periodic table. The non-negligible dipole-dipole interaction has therefore a strong influence on the properties of an ultracold atomic cloud and can even yield to new phases of matter [1]. To further increase the dipolar interaction between individual atoms in a lattice the lattice spacing has to be reduced, e.g. by means of a lattice in the UV region.

In order to find a magic wavelength we perform precise measurements on a UV transition at 359 nm with an expected linewidth of 52 kHz in an atomic beam of dysprosium. We use a electron shelving technique to amplify the spectroscopic signal on the weak transition. This enables us to map out the isotope shifts for the most abundant isotopes. In the case of fermionic Dysprosium we determine the hyperfine structure splitting and calculate the values for the hyperfine coefficients. In addition to this we give an upper bound to the lifetime of the excited state.

[1] M. Guo et al., Nature 574, 386-289 (2019)