Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 25: Poster IV
A 25.24: Poster
Mittwoch, 13. März 2024, 17:00–19:00, Tent A
Two-colour cooling for 40K-87Rb quantum gas mixtures — •Yann Hendrick Kiefer1,2, Max Hachmann2, and Andreas Hemmerich2 — 1ETH Zürich, Zürich, Schweiz — 2Universität Hamburg, Hamburg, Deutschland
We present an efficient cooling scheme for fermionic 40-potassium atoms, using laser light red and blue detuned with respect to the D2 and D1 principle flourescence lines, respectively. The cooling scheme is found to significantly increase the saturation level for loading of a 40-potassium magneto-optical trap (MOT), resulting in increased atom numbers or decreased cycle times. While the attainable 40-potassium atom number is approximately doubled if exclusively 40-potassium atoms are cooled, the scheme is particularly powerful for dual-species MOTs, for example, if 40-potassium and 87-rubidium atoms are cooled simultaneously in the same MOT configuration. The typical atom losses due to light-assisted hetero-nuclear collisions between 40-potassium and 87-rubidium seem to be reduced giving rise to a threefold improvement of the 40-potassium atom number as compared to that in a conventional dual-species MOT, operating merely with D2 light. Our scheme can be a useful extension to most dual-species experiments, aiming to reach simultaneous degeneracy of both species.