Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 3: Precision spectroscopy of atoms and ions I (joint session A/Q)
A 3.4: Talk
Monday, March 14, 2022, 14:45–15:00, A-H2
Optimal laser cooling of a single ion in a radiofrequency trap — •Daniel Vadlejch1, André Kulosa1, Henning Fürst1,2, Oleg Prudnikov3, and Tanja Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 3Institute of Laser Physics, 630090, Novosibirsk, Russia
We present a systematic study of quench cooling of a single ion trapped in a linear radiofrequency (RF) Paul trap. In our experiments, a narrow electronic quadrupole transition near 411 nm in 172 Yb+ is used for resolved sideband cooling [1]. The cooling transition is effectively quench-broadened by means of a laser at 1650 nm, coupling the excited state of the transition to a higher-lying, fastly decaying state. We control the broadening via the intensity of the quenching field and distinguish different regimes of laser cooling. We show optimum cooling parameters for rapid cooling towards the motional ground state of the trap and discuss their impact on the population distribution of Fock states during the cooling process. The presented work builds the fundament for further multi-ion experiments, e.g, using large mixed-species crystals with different cooling properties for optical clocks [2].
[1] D. Kalincev et al., Quantum Sci. Technol. 6, 034033 (2021).
[2] J. Keller et al., Phys. Rev. A 99, 013405 (2019).