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arXiv · 2203.11617

Preparation of ultra-cold atomic-ensemble arrays using time-multiplexed optical tweezers

Katja Gosar·Vesna Pirc Jevšenak·Tadej Mežnaršič·Dušan Babič·Igor Poberaj·Erik Zupanič·Peter Jeglič
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Abstract

We use optical tweezers based on time-multiplexed acousto-optic deflectors to trap ultra-cold cesium atoms in one-dimensional arrays of atomic ensembles. For temperatures between 2.5 $μ$K and 50 nK we study the maximal time between optical tweezer pulses that retains the number of atoms in a single trap. This time provides an estimate on the maximal number of sites in an array of time-multiplexed optical tweezers. We demonstrate evaporative cooling of atoms in arrays of up to 25 optical tweezer traps and the preparation of atoms in a box potential. Additionally, we demonstrate three different protocols for the preparation of atomic-ensemble arrays by transfer from an expanding ultra-cold atomic cloud. These result in the preparation of arrays of up to 74 atomic ensembles consisting of $\sim$100 atoms on average.

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Katja Gosar, Vesna Pirc Jevšenak, Tadej Mežnaršič, Dušan Babič, Igor Poberaj, Erik Zupanič, Peter Jeglič. 2022-07-21. Preparation of ultra-cold atomic-ensemble arrays using time-multiplexed optical tweezers. https://doi.org/10.1103/physreva.106.022604

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