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MO: Fachverband Molekülphysik

MO 12: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)

MO 12.31: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

A comparison of sub-Doppler cooling techniques using a nano-structured atom chip — •Kai-Christian Bruns, Julian Lemburg, Joseph Muchovo, Vivek Chandra, Sam Ondracek, Hendrik Heine, and Ernst M. Rasel — Leibniz Universität Hannover, Institut für Quantenoptik

In the field of cold atomic physics, various sub-Doppler cooling techniques are being used. We investigate two different molasses cooling schemes using an atom chip with a nano-fabricated grating. These chips simplify and miniaturize quantum systems by enabling the trapping of atoms in a MOT with a single incident beam. Additionally, the use of grating atom chips also enhances the scalability and portability of such devices. These techniques holds promise for a wide array of applications, from fundamental research to practical implementations in earth observation.

In this poster, we compare sub-Doppler cooling of ⁸⁷Rb utilizing bright and gray molasses techniques. We manage to cool the atoms to 13 µK and 5 µK respectively. Additionally, we see an increase in phase-space density by a factor of three, when comparing gray molasses to bright molasses. To understand the benefits that this improvement could bring to experiments employing Bose-Einstein-condensates, we study the transfer into a magnetic trap.

Keywords: Sub-Doppler cooling; Single beam gMOT; Atom chip; Optical grating; Gray molasses