LECTURE: Vladan Vuletić

„Laser cooling of Rb to Bose-Einstein condensation“

will be given by Vladan Vuletić from MIT Department of Physics.

The talk will be held on Tuesday, 27. March 2018 at 13:30 in the library reading room “Dr. Dragan Popović” of the Institute of Physics Belgrade.

ABSTRACT:

The procedure for attaining quantum degeneracy in atomic gases almost exclusively rely on a final evaporative cooling, a time-consuming step associated with substantial atom loss. We demonstrate direct laser cooling of a gas of 87Rb atoms to quantum degeneracy. The method is fast and induces little atom loss. The atoms are trapped in a two-dimensional optical lattice that enables cycles of compression to increase the density followed by Raman sideband cooling to decrease the temperature. From a starting number of 2000 atoms, 1400 atoms reach quantum degeneracy in 300 milliseconds, as confirmed by a bimodal velocity distribution. The method should be broadly applicable to many bosonic and fermionic species and to systems where evaporative cooling is not possible.