CONTINUOUS POLARIZATION-GRADIENT PRECOOLING-ASSISTED VELOCITY-SELECTIVE COHERENT POPULATION TRAPPING

We show that polarization-gradient cooling occurs in the A system, sim ultaneously with velocity-selective coherent population trapping (VSCP T). Starting with a Doppler temperature sample, this process precools atoms and contains them, to within twice the recoil velocity, a range efficiently capturable by VSCPT. For sodium, this cooling may enhance the rate of three-dimensional VSCPT by 200 times over the rate achieva ble from Doppler precooling alone. We estimate that in 8 msec, for exa mple, the atoms would be cooled in three dimensions to one-fourth the recoil temperature.