Trapping and cooling cesium atoms in a speckle field

We present the results of two experiments where cold cesium atoms are trapp ed in a speckle field. In the first experiment, a YAG laser creates the spe ckle pattern and induces a far-detuned dipole potential which is a nearly-c onservative potential. Localization of atoms near the intensity maxima of t he speckle field is observed. In a second experiment we use two counterprop agating laser beams tuned close to a resonance line of cesium and in the li n perpendicular to lin configuration, one of them being modulated by a holo graphic diffuser that creates the speckle field. Three-dimensional cooling is observed. Variations of the temperature and of the spatial diffusion coe fficient with the size of a speckle grain are presented.