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Journal of Atomic and Molecular Physics

Excitation of lithium atoms and population trapping induced by single frequency-chirped laser pulses

Wu Su

Published Jan 1, 2010• 0 citations
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Abstract

Using the time-dependent multilevel approach (TDML),we have calculated the coherent population transfer among the quantum states of lithium atom with different frequency-chirped laser pulses. The result shows that the population is very sensitive to the parameters of laser pulse,the population can be completely transferred to the target state and be trapped there by changing the parameters of the laser pulse.

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Using the time-dependent multilevel approach (TDML),we have calculated the coherent population transfer among the quantum states of lithium atom with different frequency-chirped laser pulses. The result shows that the population is very sensitive to the parameters of laser pulse,the population can be completely transferred to the target state and be trapped there by changing the parameters of the laser pulse.
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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 a time-dependent multilevel approach, we demonstrate that lithium atoms can be transferred to states of lower principle quantum number by exposing them to a frequency chirped microwave pulse. The population transfer from n = 79 to n = 70 states of lithium atoms with more than 80% efficiency is achieved by means of the sequential two-photon Δn = −1 transitions. It is shown that the coherent control of the population transfer can be accomplished by the optimization of the chirping parameters and microwave field strength. The calculation results agree well with the experimental ones and novel explanations have been given to understand the experimental results.