Generation of Bose-Einstein Condensate using Near Optical Resonant Trap

Amy Van Newkirk, L. Suzanne Leslie, Azure Hansen +1 more

Rainer Dumke, M. Johanning, E. Gómez +3 more

We demonstrate an all-optical technique to evaporatively produce sodium Bose–Einstein condensates (BEC). We use a crossed-dipole trap formed from light near 1 μm, and a simple ramp of the intensity to force evaporation. In addition, we introduce photoassociation as diagnostic of the trap loading process, and show that it can be used to detect the onset of BEC. Finally, we demonstrate the straightforward production of multiple traps with condensates using this technique, and that some control over the spinor state of the BEC is achieved by positioning the trap as well.

S. Tojo, M. Iwata, Asako Tomiyama +2 more

We have experimentally investigated and analyzed the dynamical properties of87Rb Bose-Einstein condensates (BEC) in the optical trap generated by the crossed far-off resonant laser beams. A variety of internal degrees of freedom, and many interesting dynamics were observed.

F. Kh. Abdullaev, Bakhtiyor B. Baizakov, V. V. Konotop

Andrés Ulibarrena

H. Davies, Charles S. Adams

The size of alkali vapour Bose-Einstein condensates is determined by the number of atoms which can be collected in a magneto-optical trap. This number is limited by processes involving near-resonant light. A possible technique to exceed the number limit is to load a conservative trap which is spatially separated from the laser cooling region. Here we report on an experiment where cold atoms are transferred from a magneto-optical trap to a spatially separated magnetic trap using an optically guided atomic fountain. This technique offers efficient transfer without requiring any near-resonant light. The extension to multiple and continuous loading is discussed, and we conclude that loading a spatially separated conservative trap offers a promising route towards steady-state Bose-Einstein condensation.