Cooling, collisions and coherence of cold cesium atoms in a trap

Summary form only given. The gravito-optical surface trap (GOST) confines cesium atoms by a blue-detuned repulsive evanescent wave (EW) in combination with gravity. Horizontal confinement is provided by the conservative optical dipole potential of a hollow, cylindrical laser beam, far blue-detuned from resonance. For preparing a very cold and dense cesium gas in the GOST, we use evanescent wave 'Sisyphus' cooling, which is based on inelastic reflections of the atoms from the EW. Using this method we have obtained a temperature of 3 /spl mu/K, which corresponds to an average distance of the atoms from the surface of 19 /spl mu/m. As a very important feature for attaining very high densities, EW cooling allows one to keep the atoms predominantly in the absolute ground state, thus avoiding trap loss by light assisted collisions.Summary form only given. The gravito-optical surface trap (GOST) confines cesium atoms by a blue-detuned repulsive evanescent wave (EW) in combination with gravity. Horizontal confinement is provided by the conservative optical dipole potential of a hollow, cylindrical laser beam, far blue-detuned from resonance. For preparing a very cold and dense cesium gas in the GOST, we use evanescent wave 'Sisyphus' cooling, which is based on inelastic reflections of the atoms from the EW. Using this method we have obtained a temperature of 3 /spl mu/K, which corresponds to an average distance of the atoms from the surface of 19 /spl mu/m. As a very important feature for attaining very high densities, EW cooling allows one to keep the atoms predominantly in the absolute ground state, thus avoiding trap loss by light assisted collisions.

Quantum Electronics and Laser Science ConferenceJan 20, 20030 citations

Laser Cooling and Trapping of Cesium Atoms

Muhammad Naeem Anwar

Jan 1, 20160 citations

An Opto-electric Trap for Cold Atoms

P. Lemonde, O. Morice, E. Peik +4 more

We present a new type of conservative trap for cold atoms: a static electric field creates a position-dependent Stark potential to compensate gravity and a far-off-resonance laser beam provides transverse confinement. We demonstrate this Opto-Electric Trap (OET) on cesium atoms, using a ring electrode at 12 kV and a Ti-sapphire laser. Loaded from a magneto-optical trap, up to 2.5 · 10 5 atoms are captured in the OET. The 1/ e lifetime is ∼1 s, presently limited by collisions with the background gas. This trap is well suited for subrecoil laser cooling and evaporative cooling of confined atoms.We present a new type of conservative trap for cold atoms: a static electric field creates a position-dependent Stark potential to compensate gravity and a far-off-resonance laser beam provides transverse confinement. We demonstrate this Opto-Electric Trap (OET) on cesium atoms, using a ring electrode at 12 kV and a Ti-sapphire laser. Loaded from a magneto-optical trap, up to 2.5 · 10 5 atoms are captured in the OET. The 1/ e lifetime is ∼1 s, presently limited by collisions with the background gas. This trap is well suited for subrecoil laser cooling and evaporative cooling of confined atoms.

Europhysics Letters (EPL)Dec 1, 199520 citations

Cavity cooling of cesium atoms

Hilton W. Chan

Jan 1, 20031 citation

Theoretical calculation of collisions between ultra-cold Cesium atoms in a magnetic field

Paul J. Leo, Eite Tiesinga, Paul S. Julienne

APSMay 1, 19980 citations

Very long storage times and evaporative cooling of cesium atoms in a quasielectrostatic dipole trap

H. Engler, Tino Weber, Marcel Carto Constantin Mudrich +2 more

We have trapped cesium atoms over many minutes in the focus of a ${\mathrm{CO}}_{2}$ -laser beam employing an extremely simple laser system. Collisional properties of the unpolarized atoms in their electronic ground state are investigated. Inelastic binary collisions changing the hyperfine state lead to trap loss, which is quantitatively analyzed. Elastic collisions result in evaporative cooling of the trapped gas from 25 $\ensuremath{\mu}\mathrm{K}$ to 10 $\ensuremath{\mu}\mathrm{K}$ over a time scale of about 150 s.We have trapped cesium atoms over many minutes in the focus of a ${\mathrm{CO}}_{2}$-laser beam employing an extremely simple laser system. Collisional properties of the unpolarized atoms in their electronic ground state are investigated. Inelastic binary collisions changing the hyperfine state lead to trap loss, which is quantitatively analyzed. Elastic collisions result in evaporative cooling of the trapped gas from 25 $\ensuremath{\mu}\mathrm{K}$ to 10 $\ensuremath{\mu}\mathrm{K}$ over a time scale of about 150 s.

arXiv:physics/0003075Physical Review AAug 15, 200045 citations

We have trapped cesium atoms over many minutes in the focus of a

{\mathrm{CO}}_{2}

-laser beam employing an extremely simple laser system. Collisional properties of the unpolarized atoms in their electronic ground state are investigated. Inelastic binary collisions changing the hyperfine state lead to trap loss, which is quantitatively analyzed. Elastic collisions result in evaporative cooling of the trapped gas from 25 $\ensuremath{\mu}\mathrm{K}$ to 10 $\ensuremath{\mu}\mathrm{K}$ over a time scale of about 150 s.