Blue-Sisyphus cooling in cesium gray molasses and antidot lattices

We present an experimental study of the kinetic temperature of cesium atoms interacting with laser beams tuned on the blue side of the 6S(1/2)(F = 3) --> 6P(3/2) (F' = 2) transition. In the case of a three-dimensional four-be am molasses, temperatures as low as 800 nK were found. These low temperatur es are compatible with a good capture efficiency. The influence of other hy perfine transitions on the temperature is significant. In the presence of a static magnetic field (antidot lattices), the temperatures are slightly hi gher but show a much weaker dependence on the other hyperfine transitions.