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Journal of Xingyi Normal University for Nationalities

Excitation of Potassium Atoms in Frequency-chirped sine Laser Pulses

Xiaotian Guo

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

The feature of coherent population transfer of Rydberg potassium atom in frequency-chirped sine laser pulses is studied by using time-dependent multilevel approach(TDML).The calculation result indicates that the period of population oscillation is twice as long as the time delay of frequency-chirped sine laser pulses,using the appropriate chirped speed can enhance the rate of population transfer.

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The feature of coherent population transfer of Rydberg potassium atom in frequency-chirped sine laser pulses is studied by using time-dependent multilevel approach(TDML).The calculation result indicates that the period of population oscillation is twice as long as the time delay of frequency-chirped sine laser pulses,using the appropriate chirped speed can enhance the rate of population transfer.
The characteristic of population transfer of potassium atom by frequency-chirped super-gauss laser pulses is studied by using time-dependent multilevel approach(TDML).With the calculation of the population transfer of Rydberg potassium atoms with different super gauss index and half pulse width,the population is excited to the target states eventually.By studying the system's dynamic Rabi frequency,it has been found out that trapped population doesn't consist in the magnitude of the Rabi frequency,but in the change of the sign of Rabi frequency in appropriate time.
Using the time-dependent multilevel approach, we have calculated the coherent population transfer between the quantum states of potassium atom by a single frequency-chirped laser pulse. The result shows that a pair of sequential 'broadband' frequency-chirped laser pulses can efficiently transfer population from the initial state of the ladder system to the target state. It is also found that the population can be efficiently transferred to a target state and trapped there by using an 'intuitive' or a 'counterintuitive' frequency sweep laser pulse in the case of 'narrowband' frequency-chirped laser pulse. Our research shows that the complete population transfer is related to the pulse duration, chirp rate, and amplitude of the laser pulse.
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 Λ atom to the other one.
Using the time-dependent multilevel approach (TDML), this paper studies the dynamics of coherent control of Rydberg lithium atoms and demonstrates that Rydberg lithium atoms can be transferred to states of higher principal quantum number by exposing them to specially designed frequency-chirped laser pulses. The population transfer from n = 70 to n = 75 states of lithium atoms with efficiency of more than 90% is achieved by means of the sequential adiabatic rapid passages. The results agree well with the experimental ones and show that the coherent control of the population transfer from the lower n to the higher n states can be accomplished by the optimization of the chirping parameters and the intensity of laser field.