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Journal of Hefei University of Technology

On the squeezing effect of the light field in a Λ-type degenerate quantum-beat three-level system

Zhuo‐Liang Cao

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

The dynamic behavior of the interaction between a Λ-type degenerate quantum-beat three-level atomic system and a coherent light field is discussed in light of the time evolution operator.The squeezed state of the light field is also studied in this paper.

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The atomic dipole squeezing is a very important phenomenon in the interaction between an atom and an optical field, but the atomic dipole squeezing of a three-level atom with an intensity-dependent coupling is seldom reported. By using a full quantum theory, We investigate the time-evolution properties of the atomic dipole squeezing of the degenerate quantum-beat three-level atom intensity-dependently interacting with a single-mode coherent field, and explore effects of splitting of the lower energy levels of the atom, the field intensity and the initial atomic coherence on the atomic dipole squeezing. Our results show that, when the two lower levels of the atom is degenerate, dipole squeezing parameters evolve periodically with time, and the splitting of the lower levels destroy this periodicity and reduce the amount of dipole squeezing. The relationship between the amount of dipole squeezing and the initial coherent field intensity is not monotonous. The initial atomic coherence has a great influence on the dipole squeezing.
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By using the full quantum theory,the time evolution of atomic dipole squeezing parameters of a Λ-type three-level atom interacting with a single-mode coherent cavity field is investigated.The influence of the initial coherent-field intensity,the initial atomic coherence,the initial populations on the two lower atomic levels and their energy splitting on the atomic dipole squeezing are studied.Results show that the amount of dipole squeezing increases while the duration of dipole squeezing decreases with increasing initial field intensity.In the case of degenerate lower atomic states maximum dipole squeezing is reached when the two states have equal initial phases and equal populations.Exchange of initial populations in the lower atomic states does not influence time evolution of diploe squeezing.Atomic energy level splitting is helpful to dipole squeezing generation under certain conditions.