We study the temporal evolution of a three-level system (such as an atom or a molecule), initially prepared in an excited state, bathed in a laser field tuned at the transition frequency of the other level. The features of the spontaneous emission are investigated and the lifetime of the initial state is evaluated: a Fermi ‘‘golden rule’’ still applies, but the on-shell matrix elements depend on the intensity of the laser field. In general, the lifetime is a decreasing function of the laser intensity. The phenomenon we discuss can be viewed as an ‘‘inverse’’ quantum Zeno effect and can be analyzed in terms of dressed states.
Spontaneous emission and lifetime modification caused by an intense electromagnetic field
FACCHI, PAOLO;PASCAZIO, Saverio
2000-01-01
Abstract
We study the temporal evolution of a three-level system (such as an atom or a molecule), initially prepared in an excited state, bathed in a laser field tuned at the transition frequency of the other level. The features of the spontaneous emission are investigated and the lifetime of the initial state is evaluated: a Fermi ‘‘golden rule’’ still applies, but the on-shell matrix elements depend on the intensity of the laser field. In general, the lifetime is a decreasing function of the laser intensity. The phenomenon we discuss can be viewed as an ‘‘inverse’’ quantum Zeno effect and can be analyzed in terms of dressed states.File in questo prodotto:
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