Sideband laser cooling using stimulated Raman transitions is performed on trapped cesium atoms. The confinement is produced by a far–off-resonance dipole trap consisting of two crossed YAG beams which, by interference, create a one-dimensional optical lattice. In a pure intensity lattice, we measure a 1D temperature of T = 6 μK corresponding to a mean quantum vibrational number of about ⟨ n v ⟩ = 0.75. In a polarization gradient lattice, the final temperature is T = 3.6 μK corresponding to ⟨ n v ⟩ ≃ 2.4.
Sideband laser cooling using stimulated Raman transitions is performed on trapped cesium atoms. The confinement is produced by a far–off-resonance dipole trap consisting of two crossed YAG beams which, by interference, create a one-dimensional optical lattice. In a pure intensity lattice, we measure a 1D temperature of T = 6 μK corresponding to a mean quantum vibrational number of about nv = 0.75. In a polarization gradient lattice, the final temperature is T = 3.6 μK corresponding to nv 2.4.
We study the behavior of cesium atoms confined in far-detuned laser traps and submitted to blue Sisyphus cooling. First, in a single focused yttrium aluminum garnet (YAG) beam, the atomic cloud has a rod shape with a $6\ensuremath{-}\ensuremath{\mu}\mathrm{m}$ transverse waist radius, a temperature of $2\ensuremath{\mu}\mathrm{K}$, and a transient density of 10
12atoms/cm3. For this sample, we have not detected any influence of photon multiple scattering on the atomic temperature, in contrast to previous measurements in isotropic samples. Second, the YAG laser is used to produce a $29\ensuremath{-}\ensuremath{\mu}\mathrm{m}$ period hexagonal optical lattice in which we directly observe the localization of the atoms by absorption imaging. Equilibrium densities on the order of
1013atoms/cm3 are achieved in this structure.