SAMOP 2021 – scientific programme
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A: Fachverband Atomphysik
A 16: Ultra-cold atoms, ions, and BEC (joint session A/Q)
A 16.4: Poster
Wednesday, September 22, 2021, 16:30–18:30, P
Long-distance transport of ultracold gases in an optical dipole trap utilizing focus-tunable lenses — •Maximilian Kaiser1,2, Sian Barbosa1, Jennifer Koch1, Felix Lang1, Benjamin Nagler1, and Artur Widera1 — 1Physics Department, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern — 2Physics Institute, Heidelberg University, Im Neuenheimer Feld 226, 69120 Heidelberg
In order to integrate novel optical techniques into packed quantum gas experiments, different transport approaches have been developed to bridge the gap between different sections of the experimental vacuum chamber.
We report on the realization of an optical dipole trap (ODT) transport system for ultracold gases based upon [1]. A lens system around a commercially available focus-tunable lens shifts the focus of a red-detuned ODT beam through the vacuum chamber, effectively moving trapped atoms while maintaining constant trapping conditions throughout the entire transport. We have developed a scheme for precise alignment, characterized the focal shift, and studied its spatial stability. We have verified its functionality and found spatial stability of the focus on the micrometer scale. The system is integrated into a lithium-6 quantum-gas experiment, where the transport trap is loaded with efficiencies of more than 90% for both BECs and thermal gases. Ultimately, we demonstrate the transport of an ultracold quantum gas over a distance of 507mm.
[1] Julian Léonard et al., New J. Phys. 16 093028 (2014)