Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 34: Poster Quantengase
Q 34.19: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
Towards an All-Optical Realisation of a Quantum-Degenerate Potassium-40 Fermi-Gas — •Christian Bolkart, Alexander Gatto, and Martin Weitz — Physikalisches Institut, Auf der Morgenstelle 14, 72076 Tübingen
We are working on the realization of a degenerate 40K Fermi gas based on direct evaporative cooling of atoms in an optical dipole trap. The quantum gas will we used for the search for novel quantum phase transitions in optical lattices.
The required near-resonant radiation for laser cooling and trapping of atoms is derived from a home-made Oscillator-Optical Power Amplifier (MOPA) system. Our setup uses a magneto optical trap (MOT) for the fermionic atoms that is loaded by the cold atomic beam created with a 2D-MOT. After a temporal dark-MOT phase, the atoms will transferred into an optical dipole trap realised with a focused CO2-laser beam. To enhance the collisional cross section during the subsequent evaporative cooling towards quantum degeneracy, a Feshbach-resonance of the mF = −7/2 and mF = −9/2 spin projections of the F = 9/2 hyperfine ground state is employed. The interaction of atoms in these two states can be controlled by an external magnetic field.