Sympathetic Cooling with Two Atomic Species in an Optical Trap

Details Sympathetic Cooling with Two Atomic Species in an Optical Trap Sympathetic Cooling with Two Atomic Species in an Optical Trap

2001-11-30

arxiv.org/abs/physics/0111213v1

Phys. Rev. Lett. 88, 253001 (2002).

Physics

Atomic Physics

4 pages 3 figs

Scientific paper

10.1103/PhysRevLett.88.253001

We simultaneously trap ultracold lithium and cesium atoms in an optical dipole trap formed by the focus of a CO$_2$ laser and study the exchange of thermal energy between the gases. The cesium gas, which is optically cooled to $20 \mu$K, efficiently decreases the temperature of the lithium gas through sympathetic cooling. The measured cross section for thermalizing $^{133}$Cs-$^7$Li collisions is $8 \times 10^{-12}$ cm$^2$, for both species in their lowest hyperfine ground state. Besides thermalization, we observe evaporation of lithium purely through elastic cesium-lithium collisions (sympathetic evaporation).

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