[institut] Seminar - Vladan Vuletic Utorak 27. mart

[Brana Jelenkovic]

U utorak, 27 marta, u 13:30 h u Biblioteci Dragan Popovic

                       Vladan Vuletic
Department of Physics, Massachusetts Institute of Technology, USA

odrzace predavanje

             Laser cooling of Rb to Bose-Einstein condensation

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.


-- 
Brana Jelenkovic
Photonics Center
Institute of Physics
University of Belgrade
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