  Optical pumping is a technique for engineering atomic-sublevel population of
desired atoms. We investigate the population evolution of Cesium atoms by
employing Liouville equation. For this purpose, we apply a circularly polarized
light at a frequency suitable for electronic transition from ground states to
excited states and calculate the relaxation rate, repopulation, and population
evolution of the Cesium Zeeman sublevels. For engineering the sublevel
population after optical pumping, we employ a radiofrequency (RF) field and
consider the effect of RF field in Liouville equation. With this approach, we
are able to prepare desired distribution of the population in the atomic
sublevels with high efficiency, which can be employed in different optical
experiments.
