https://doi.org/10.1140/epjd/s10053-022-00361-2
Regular Article – Cold Matter and Quantum Gases
Efficient 2D molasses cooling of a cesium beam using a blue detuned top-hat beam
1
Orsay Physics, ZAC ST Charles, 3ème Avenue, no95, 13710, Fuveau, France
2
Laboratoire Photonique Numérique et Nanosciences (LP2N), UMR 5298, IOGS-CNRS, Université de Bordeaux, 33400, Talence, France
3
AzurLight Systems, 33600, Pessac, France
4
iXblue, 33400, Talence, France
5
Université Paris-Saclay, CNRS, Laboratoire Aimé Cotton, 91405, Orsay, France
j
daniel.comparat@universite-paris-saclay.fr
Received:
1
October
2021
Accepted:
4
February
2022
Published online:
20
February
2022
We have performed a 2D blue detuned Sisyphus collimation of a cesium beam. Compared to a red detuned Doppler transverse molasses cooling, the setup was found very advantageous because of its faster cooling time allowing a short (
) cooling length and thus finally a denser atomic beam. A fibered laser was developed delivering up to 
fiber coupled optical power. A 2D collimation was realized but this can be done only if the two cooling zones were not overlapping. A beam density enhancement of more than 10 was observed. We found that a simple top-hat beam was more efficient than a Gaussian one. Similar cooling applies to other atom species and leads to a simple method to produce bright collimated atomic beams.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022
