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International Conference on Laser Interactions and Related Plasma Phenomena (LIRPP)

The influence of quantum interference on spontaneous emission

V. I. Savchenko, A. A. Panteleev, А. Н. Старостин

Published Jan 1, 1997• 0 citations
Publisher

Abstract

Spontaneous relaxation of a three-level degenerate scheme is investigated. Two upper levels are coupled by the same quantum mode to the lower level. It is shown that the quantum interference does not modify spontaneous relaxation in free space unless the angular momenta of the upper levels are equal. However in a cavity interference can lead to modified spontaneous emission for any combination of the upper levels. Interaction of the atom with the laser field may lead to complete suppression of spontaneous emission if the lower level is the ground state.

DOI
10.1063/1.53535

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Spontaneous relaxation of a three-level degenerate scheme is investigated. Two upper levels are coupled by the same quantum mode to the lower level. It is shown that the quantum interference does not modify spontaneous relaxation in free space unless the angular momenta of the upper levels are equal. However in a cavity interference can lead to modified spontaneous emission for any combination of the upper levels. Interaction of the atom with the laser field may lead to complete suppression of spontaneous emission if the lower level is the ground state.
In this paper, the probe absorption spectrum of a four-level atom in photonic crystals has been investigated. A model is used, which assumes the transitions from the two upper levels to one of the lower levels coupled to the modes of the modified reservoir (photonic band gap) and transitions from the two upper levels to the other lower level coupled to the free vacuum modes. The effect of quantum interference in spontaneous emissions from the two upper levels to the lower levels on the absorption spectrum of an atom is investigated in detail. Most interestingly, it is shown that the atom becomes transparent to a probe laser field coupled to the free space transition only in situations where complete quantum interference takes place in both the free space transitions and the modified reservoir transitions.
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The spontaneous emission of a four-level atom embedded in a one-dimensional photonic crystal is investigated. The atom has two upper levels coupled by the same vacuum modes to a common lower level and is driven by a coherent field to an auxiliary level. Spontaneous emission can be suppressed significantly due to the combinational influences of the interference effect and the band edge effect. The radiation field emitted by the atom is also studied. Spontaneous emission can be modified by controlling the Rabi frequency of the driving.