Hannover 2020 – scientific programme

The DPG Spring Meeting in Hannover had to be cancelled! Read more ...

Parts | Days | Selection | Search | Updates | Downloads | Help

A: Fachverband Atomphysik

A 28: Poster Session - Atomic Physics IV

A 28.8: Poster

Thursday, March 12, 2020, 16:00–18:00, Empore Lichthof

Loading of sub-Doppler cooled potassium-39 ensembles into a painted optical dipole trap — •Alexander Herbst, Henning Albers, Sebastian Bode, Knut Stolzenberg, Ernst M. Rasel, and Dennis Schlippert — Institute of Quantum Optics, Leibniz University Hannover

The all-optical creation of potassium BECs is of large interest for the field of guided atom interferometry and its application for quantum inertial sensors as this technique allows for the use of external magnetic fields to control inter-atomic interactions and suppress dephasing effects. However, the direct loading of a large, thermal potassium ensemble into an optical dipole trap remains a major challenge and is crucial for all following processes.

We report on the preparation of sub-Doopler cooled potassium using a gray molasses technique on the D1-line and its loading into an optical dipole trap at 2 um wavelength. Utilizing a time-averaged potential we are able to generate different trap geometries with position-depending AC-Stark-shifts. We analyze the resulting effects on the loading and cooling efficiency of the D1-scheme and discuss possible applications for traditional sub-Doppler schemes.

This work is funded by the Federal Ministry of Education and Research (BMBF) through the funding program Photonics Research Germany (contract number 13N14875), and the DFG under Germany's Excellence Strategy (EXC 2123) "QuantumFrontiers".