Experiments with ultracold Lithium and cold caesium

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• Lucia Hackermuller (Nottingham)
• Friday 23 June 2017, 12:00-13:00
• Physics East 217.

If you have a question about this talk, please contact Dr Giovanni Barontini.

I will discuss the two experiments that we have set up recently in our lab. The first one creates degenerate quantum gases of fermionic lithium 6, e.g. either a molecular BEC or a degenerate Fermi sea.

For our strongly interacting BEC we compare three descriptions: the ideal gas, the semi-ideal description and the solution of Hartree-Fock equations. We compare these predictions to our insitu measurements.

In the second experiment we are aiming to create an efficient atom-photon interface. These have a wide range of applications, from photon storage and optical switching, to precision sensing.

We have built an atom-light interface by trapping atoms inside a micro-hole, which has been orthogonally drilled into an optical single mode fibre. In principle our system allows the addition of an optical cavity or the trapping of several ensembles in individual holes. The hole was produced using femto-second laser drilling and has a diameter of 30mum. We feed an optical dipole trap with a diameter of 26mum through this hole. The dipole trap is used to position cold caesium atoms directly at the centre of the photon mode of the optical fibre. The fibre is mounted on a glass plate and a Cs Mot with 10⁷ atoms is created directly under the chip. After molasses cooling we load about 10⁵ atoms into the dipole trap, the trap also holds the atoms against gravity. Atoms can be observed passing through the optical fibre and emerging on the other side. We perform spectroscopy on the atoms in the fibre and detail how to use our system for photon storage and magnetic field sensing.

This talk is part of the Cold atoms series.

This talk is included in these lists:

• Cold atoms
• Physics East 217

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