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Chinese Physics Letters

Peak asymmetry of ac stark splitting in resonant excitation of multilevel systems due to the existence of near-degenerate states

Meiying Hou, Zhang Jian, Qingshi Zhu

Published Jul 1, 1987• 1 citation
Publisher

Abstract

Calculation on resonant excitation of a four-level system with a pair of near-degenerate intermediate states is presented. It is shown that due to the presence of these near-degenerate states, reversed peak asymmetry and asymmetric absorption(ionization) profile is obtained.
DOI
10.1088/0256-307x/4/7/010

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We present a theory of Stark splitting in doubly resonant three-photon ionization (three-level system) with nonmonochromatic fields. The asymmetry of the peaks of the resonance curve due to Stark splitting is shown to be reversed when the laser bandwidth is larger than the width of the atomic transitions of the resonant states. It is further shown that ionization as well as the probe field have a significant effect on the features of the splitting. Similar effects are found with monochromatic fields in the presence of an additional level near the initial level (four-level system). The results of the analysis are in general qualitative agreement with existing observations.
Interaction of multilevel atoms with intense radiation fields is treated in a simplified model using a semiclassical theory. Steady-state level-populations in four-level and five-level systems are calculated. It is found that population inversion appears between the highest level and an intermediate level under intense fields. The absorption lineshape of the transition between the highest two levels in a five-level or a six-level system is calculated in a weak probe-field approximation. The lineshape for the five-level (six-level) system splits into four (five) peaks at high excitation intensities.
A semiclassical treatment is given for the serial, near-resonant interaction of three waves in seven equivalent four-level atomic or molecular systems. Explicit equations are presented for the complex susceptibilties for the three waves, valid for $t\ensuremath{\gg}{T}_{2}$, which contain implicit ac Stark-shift and -splitting information, and can be separated into one-, two-, and three-photon contributions. For the case of a weak third or terminal wave, equations for the degree of ac Stark shifting and splitting are found and indicate that the three-photon or triple-resonance contribution is immune to the optical Stark effect if the remaining two waves are tuned to at least two-photon resonance conditions. The conditions for Doppler-free triple resonance are outlined, and it is shown that an equivalent ac Stark broadening may exist but may also be minimized by an appropriate choice of field intensities.
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