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Q: Fachverband Quantenoptik und Photonik

Q 6: Ultracold atoms, ions and BEC I (with A)

Q 6.1: Vortrag

Montag, 17. März 2014, 10:30–10:45, BEBEL E34

Optical Trapping of a Barium Ion — •Thomas Huber, Alexander Lambrecht, Julian Schmidt, Michael Zugenmaier, Leon Karpa, and Tobias Schaetz — Albert-Ludwigs Universität, Freiburg, Deutschland

Trapping ions in optical dipole traps 1 or optical lattices 2 overcomes fundamental limitations for ultracold chemistry experiments set by intrinsic RF driven micromotion 3. In our former experiments, the lifetime of optically trapped Mg+ ions was limited by recoil heating. We now report the optical trapping of a Ba+ ion in a FORT where the scattering events are substantially suppressed.
We will discuss lifetimes, their limitations, such as the decay into metastable D levels, as well as results on investigating those via efficient repumping schemes. We report about a conceptually new method to compensate electric stray fields necessary to allow high transfer efficiencies between the RF trap (required for initialization) and the FORT. We propose new methods to characterize the dipole force and the related secular frequencies of an ion trapped by the optical dipole trap and the DC potentials.
The progress of a new experiment, mitigating limitations of the current setup will be reported in which the optically trapped ion interacts with atoms from a Magneto Optical Trap.
1Nature Photonics 4, 772-775 (2010)
2Phys. Rev. Lett. 109, 233004 (2012)
3Phys. Rev. Lett. 109, 253201 (2012)