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中国物理B：英文版

Emission spectrum of a harmonically trapped Λ-type three-level atom

郭红, 汤佩

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

We theoretically investigate the emission spectrum for a Λ-type three-level atom trapped in the node of a standing wave. We show that the atomic center-of-mass motion not only directly affects the peak number, peak position, and peak height in the atomic emission spectrum, but also influences the effects of the cavity field and the atomic initial state on atomic emission spectrum.

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Emission spectrum of a harmonically trapped Λ-type three-level atom

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Acta Physica Sinica•Jan 1, 2009•2 citations
We theoretically investigate the emission spectrum for a Λ-type three-level atom trapped in the node of a standing wave. We show that the atomic center-of-mass motion not only directly affects the peak number, peak position, and peak height in the atomic emission spectrum, but also influences the effects of the cavity field and the atomic initial state on atomic emission spectrum.
The emission spectrum of a two-level atom in a harmonic trap is studied. It is shown that atomic motion do not affect the atomic spectrum phase sensitivity when there is no correlation between atomic mass center motion and the field. With the increase of the average energy of atomic center motion, the peaks move towards each other, their heights change with the state of the field and atomic motion. When there is correlation between atomic mass center motion and the field, the atomic spectrum becomes insensitive to the relative phase between the field and the atomic dipole. Under certain conditions, there are fewer peaks, and they become higher and narrower.
The eigenfunction method is adopted to investigate atomic emission and cavity field spectra in the system containing a Λ-type three-level atom resonantly' interacting with a single-mode field.The atom is assumed initially in the upper atomic state and intensity-dependent coupling is taken into account.It is found that the splitting between the lower levels has a great influence on the spectral structure for both the emission spectrum and the cavity field spectrum.Combination of spectral lines does not take place with increasing intensity of the initial field and the cavity spectrum is not sensitive to the statistics of the initial field.
We present a nonperturbative result for the spectrum of spontaneous photons emitted by an atom coupled on resonance to a standing-wave cavity mode. Motion of the atom through the standing-wave mode function is included in a classical way. We discuss the form of the spectrum as a function of the velocity of the atom in the limit of strong dipole coupling. For slow atoms the normal-mode doublet (``vacuum'' Rabi spectrum) survives with small changes. The motion of a fast atom through the standing wave averages the coupling constant to zero, and the spectrum reverts to a single peak. At intermediate velocities the spectrum has a complicated multipeaked structure that can be understood in terms of interfering probability amplitudes for different quantum-mechanical emission paths or as a frequency-modulation spectrum for radiating coupled oscillators.