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Laser Physics

Properties of the spontaneous emission of a driven four-level atom coupled to separate reservoirs

X. Sun, Hongyan Shi, Xiangqian Jiang

Published Sep 1, 2008• 0 citations
Publisher

Abstract

We investigate the spontaneous emission properties of a driven four-level atom coupled to separate reservoirs. Both the effect of the external field and the influence of the photonic bandgap reservoir on the atomic spontaneous emission are discussed. It is shown that a few interesting phenomena such as a laser-induced spectral narrowing dark line can be achieved and its physical understanding can be given by invoking the dressedatom approach.

DOI
10.1134/s1054660x08090065

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•Jan 1, 2006•1 citation
We investigate the spontaneous emission properties of a driven four-level atom coupled to separate reservoirs. Both the effect of the external field and the influence of the photonic bandgap reservoir on the atomic spontaneous emission are discussed. It is shown that a few interesting phenomena such as a laser-induced spectral narrowing dark line can be achieved and its physical understanding can be given by invoking the dressedatom approach.
We study the spontaneous emission of a four-level atom with two transitions coupled to a reservoir that has a photonic bandgap near the band edge. Moreover, the transition from the upper level to an auxiliary level is driven by a laser. Considering the different detuning of the external driving field, we discuss some effects, such as a laser-induced dark line, a laser-induced line splitting, and a laser-induced pushing of a dressed state out of the bandgap, which originate from the quantum interference effect and control of the external driving field.
We study the steady-state behaviour of spontaneous emission of a driven four-level atom embedded in photonic crystals. Considering different initial conditions, we discuss the influence of photonic band gap and detuning of external driving field on the atomic spontaneous emission spectrum. The photonic band gap and external driving field will impact strongly on the atomic spontaneous emission properties. Some interesting phenomena were found such as laser-induced dark line, laser-induced spectral-line narrowing and laser-induced pushing of a dressed state out of the band gap, which can be attributed to the quantum interference effect and control of the external driving field.
We study the spontaneous-emission properties of a coherently driven four-level atom, and show a few interesting phenomena such as fluorescence quenching, spectral-line narrowing, spectral-line enhancement, and spectral-line elimination. These phenomena can be observed in experiment since the rigorous condition of near-degenerate levels with nonorthogonal dipole moments is not required here. Qualitatively, these phenomena can be attributed to the quantum interference between competitive spontaneous-decay channels in the bare-state picture or the spontaneously generated coherence between two close-lying levels in the dressed-state picture.
The spontaneous emission spectrum from a driven three-level atom placed inside a double-band photonic crystal has been investigated. We use the model which assumes the upper levels of the atomic transition are coupled via a classical driving field. The transition from one of the upper levels to lower level couples to the modes of the modified reservoir, and the transition from the other upper level to lower level interactwith the free vacuum modes. The effect of classical driving field on the spontaneous emission spectrum of this latter transition is investigated in detail. Most interestingly it is shown that only in the presence of the classical driving field; there is a black dark line in the spontaneous emission spectrum of free-space transition when the modified reservoir is of the photonic band gap type. This dark line is not seen in the case where the modified reservoir is of the free space type for relatively weak driving field.