Hannover 2003 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Quantenoptik
Q 54: Fallen und Kühlung 3
Q 54.8: Vortrag
Freitag, 28. März 2003, 15:45–16:00, E001
Optimized U-MOT for atom chip experiments — •Stephan Wildermuth1, Peter Krüger1, Christiane Becker1, Mihael Brajdic1, Sebastian Haupt1, Hartmut Gimpel1, Ron Folman1, Sönke Groth1,2, Israel Bar-Joseph2, and Jörg Schmiedmayer1 — 1Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg — 2Weizmann Institute of Science, Rehovot, Israel
Neutral atoms can be manipulated by means of magnetic, electric, and optical fields. Miniaturizing the potential creating structures and mounting them on surfaces is the idea of atom chips. Such devices have proven to be robust and versatile atom optical tools in various laboratories over the past few years. It has turned out that atom chips not only allow to create potential structures of a complexity that would not be achievable otherwise, but they also simplify the production of Bose-Einstein condensates substantially. Here, we present a simplified experimental procedure for the loading of atoms into the chip potentials. As in most atom chip experiments, cold atoms are collected in a mirror MOT a few mm above the chip surface. So far it was considered a disadvantage of such a configuration that for a large MOT the magnetic quadrupole field had to be produced by a pair of bulky coils limiting the optical access to the chip. In our scheme, the quadrupole field is exclusively created by a modified U-shaped wire mounted underneath the chip surface. Currents of 60-70A together with a homogenous bias field of 10-15G are used in our experiment to trap and cool up to 109 87Rb atoms. This project is funded by the DFG and the EU (ACQUIRE collaboration).