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Chinese Physics

Phase shift of the population oscillation and population trapping

Xianzhou Zhang, Hong-Min Jiang, Rao Jianguo, Baiwen Li

Published Sep 28, 2004• 1 citation
Publisher

Abstract

Using our recently developed time-dependent multilevel approach, we have calculated the phase shift of the population oscillation of the excited potassium atom in frequency-modulated fields when the modulation amplitude is suddenly changed. The numerical results are in good agreement with the measurements. A new way of realizing population trapping is suggested.

DOI
10.1088/1009-1963/13/10/003

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Using our recently developed time-dependent multilevel approach, we have calculated the phase shift of the population oscillation of the excited potassium atom in frequency-modulated fields when the modulation amplitude is suddenly changed. The numerical results are in good agreement with the measurements. A new way of realizing population trapping is suggested.
A time-dependent perturbation method is proposed to study the properties of the frequency-modulated excitation of a potassium atom. Rabi oscillations in the absence of a modulation, square-wave oscillations in the presence of slow modulation, and radio-frequency multiphoton resonances in the presence of fast modulation have been calculated using this method. The numerical results are in excellent agreement with those of the experiment; novel explanations have been given to understand some of the experimental results.
Using the time-dependent multilevel approach(TDMA), we have calculated the square wave oscillation of the excited Rydberg potassium atoms in the presence of the microwave field, the static electric field and the radio-frequency(rf)field. Through changing the phase of the radio-frequency(rf)field and replacing the slow radio-frequency(rf) cosine sawtooth wave with the slow radio-frequency(rf) sawtooth wave, we have studied the change of the square wave oscillation and got some interesting results, and the theoretic explanation of these results are given.