ONE-DIMENSION SUB-DOPPLER MOLASSES IN THE PRESENCE OF STATIC MAGNETIC-FIELD

Sub-Doppler cooling has been achieved for the two closed hyperfine transitions: F = 4 --> F' = 5 and F = 3 --> F' = 2, of the cesium D2 line. One-dimension optical molasses is experimentally investigated and compared for both j --> j + 1 and j --> j - 1 transitions, on different laser polarization configurations, in the presence, and absence of a static magnetic field. One remarkable point is that cooling is obtained with blue laser detuning for the j --> j - 1 transition. An applied static magnetic field can also shift the sub-Doppler-cooled molasses peaks to nonzero velocities without any extra heating, for the polarization gradient configurations.