By using the time-dependent multilevel approach, we have calculated the coherent population transfer among the quantum states of potassium atom by a single frequency-chirped laser pulse. The results show that the population can be efficiently transferred to a target state and be trapped there by using an ＇intuitive＇ or a ＇counter-intuitive＇ frequency sweep laser pulse in the case of ＇narrowband＇ frequency-chirped laser pulse. It is also found that a pair of sequential ＇broadband＇ frequency-chirped laser pulses can efficiently transfer population from one ground state of the A atom to the other one.
In this paper, the dynamics of coherent laser control of potassium atoms is studied by using the time-dependent multilevel approach （TDMA）. The calculation results of population transfer are presented with different laser fields. The results show that the population can be transferred to target state completely by a specially designed laser field.
