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Spontaneous Decay of an Atom Near a Phase Conjugator.

Author: Henk F Arnoldus; Thomas F George; WASHINGTON STATE UNIV PULLMAN Dept. of CHEMISTRY.
Publisher: Ft. Belvoir : Defense Technical Information Center, MAR 1992.
Edition/Format:   eBook : English
Database:WorldCat
Summary:
Relaxation of the density operator of an atom near a four-wave mixing phase conjugator (PC) is studied. The relaxation operator Tau can be expressed in the Cartesian components of the atomic dipole operator and correlation functions of the vacuum electromagnetic field. We evaluate these correlation functions in terms of the Fresnel coefficients for reflection and transmission of a polarized monochromatic plane wave.  Read more...
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Material Type: Internet resource
Document Type: Internet Resource
All Authors / Contributors: Henk F Arnoldus; Thomas F George; WASHINGTON STATE UNIV PULLMAN Dept. of CHEMISTRY.
OCLC Number: 227778923
Notes: Technical rept.
Description: 64 pages ; 23 x 29 cm

Abstract:

Relaxation of the density operator of an atom near a four-wave mixing phase conjugator (PC) is studied. The relaxation operator Tau can be expressed in the Cartesian components of the atomic dipole operator and correlation functions of the vacuum electromagnetic field. We evaluate these correlation functions in terms of the Fresnel coefficients for reflection and transmission of a polarized monochromatic plane wave. Our expression for Tau includes both linear and nonlinear interactions in the medium, and it reduces to well-known results in the limits of a pure dielectric, a mirror, and empty space. The example of a model two-state atom in combination with a model PC is worked out in detail. From the rate equations for the populations of the levels we infer that the relaxation acquires a contribution from both ordinary spontaneous decay and stimulated transitions which are induced by the PC. It is shown that an atom in its ground state has a finite probability of being excited, and that the excited state has a finite population in the long-time limit. We also work out the case of a degenerate two-level atom in combination with a realistic model of a transparent PC, and it is shown that our present results for the transition rates are consistent with earlier calculations of the fluorescence yield.

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