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Acta Physica Sinica (Overseas Edition)

Phase properties of the radiation fields in Raman process

Peng Zhou

Published Jun 1, 1993• 3 citations
Publisher

Abstract

The general evolution of the interaction of two radiation fields with an effective two-level atom via the Raman-type transitions is presented. Using the Pegg-Barnett phase theory, the joint phase probability distribution of the two field modes, phase average values and phase fluctuations are studied in detail. Also, the effect of the presence of a field on the phase properties of the other mode is examined.

DOI
10.1088/1004-423x/2/6/001

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Acta Sinica Quantum Optica•Jan 1, 2009•0 citations
The general evolution of the interaction of two radiation fields with an effective two-level atom via the Raman-type transitions is presented. Using the Pegg-Barnett phase theory, the joint phase probability distribution of the two field modes, phase average values and phase fluctuations are studied in detail. Also, the effect of the presence of a field on the phase properties of the other mode is examined.
The properties of the phase evolution of two coupled atoms Raman interacting with squeezed vacuum field are studied using the Pegg-Barnett phase theory. The phase probability distribution and variance are calculated. The evolution of the phase probability distribution functions in some cases are given by curves in the polar coordinate system. The influence of Raman interaction between the coupled atoms with squeezed vacuum field, the dipole-dipole interaction between the atoms and the initial states of atoms on the phase properties are discussed.
By means of Pegg and Barnett phase formalism,the phase properties of the field interacting with two Λ-type three-level atoms via Raman coupling in a phase damped cavity is discussed.The influences of decay coefficient of the cavity and the intensity of the field on the phase distribution as well as its fluctuation are discussed.The results show: if there is absence of the phase damping,the phase distribution oscillates with the period π/λ.It presents single leaf at t=nπ/λ,but it splits into multi-leaf construction during the evolution period due to the interaction between the field and the atoms.If there is presence of the phase damping,the obvious leaf construction of the phase distribution become obscure and contract into a circle,which indicates the random distribution of the phase.Moreover,the larger the decay coefficient is,the more rapidly the phase becomes random distribution.The narrowing of the leaf and the increasing amplitude of the phase distribution corresponds to a stronger field.The phase fluctuation shows damped oscillatory behavior and ultimately reaches a steady value in the phase damped cavity.The time for it to approach the steady value shortens when decay coefficient increases.