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A: Fachverband Atomphysik

A 22: Ultra-cold atoms, ions and BEC III (with Q)

A 22.4: Vortrag

Mittwoch, 25. März 2015, 11:45–12:00, M/HS1

Optical trapping of Barium ions for ion-atom collision experiments — •Julian Schmidt¹, Alexander Lambrecht¹, Georg Hoppe¹, Leon Karpa^1,2, and Tobias Schaetz¹ — ¹Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany — ²Freiburg Institute for Advanced Studies (FRIAS), Albertstrasse 19, 79104 Freiburg, Germany

Optical trapping of ions has been demonstrated recently [1,2]. In these experiments, the trapping beam is tuned close to the atomic resonance and off-resonant scattering resulted in severe recoil heating. We now present a recent experiment [3] in which we use a far-detuned optical dipole trap to trap a single Barium ion without any rf confinement, reducing recoil heating by four orders of magnitude.

We also describe a novel technique for micromotion compensation [3], in which the tightly focused optical trapping laser creates a position dependent ac-Stark shift. We can then measure the position of the ion with high resolution, allowing us to compensate stray fields to below 9mV/m.

In our improved setup, the optically trapped ion can be overlapped with a cloud of cold Rb atoms trapped inside in a magneto-optical and bichromatic optical dipole trap. This should allow us to avoid rf induced heating effects inherent to hybrid atom-ion traps [4].

[1] C. Schneider et al., Nat. Photon. 4, 772-775 (2010)

[2] M. Enderlein et al., Phys. Rev. Lett. 109, 233004 (2012)

[3] T. Huber et al., Nat. Comms 5, 5587 (2014)

[4] M. Cetina et al., Phys. Rev. Lett. 109, 253201 (2012)