Angular Distribution and Polarization of Superradiant Emission from Atomic Ensembles
World Journal of Applied Physics
Volume 5, Issue 1, March 2020, Pages: 1-14
Received: Mar. 1, 2020;
Accepted: Mar. 13, 2020;
Published: Apr. 1, 2020
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Verne Louis Jacobs, Center for Computational Materials Science, Code 6390, Materials Science and Technology Division, Naval Research Laboratory, Washington, D. C., U.S.A
A density-matrix approach is developed to provide a theoretical description of the intensity, angular distribution, and polarization of superradiative emission from an ensemble of many-electron atomic systems. The many-electron atomic systems are described as cooperatively interacting by means of forces that can be long range. Particular emphasis is given to the coherent excitation of the collective atomic-ensemble states, which may be produced by incident laser radiation. The initial excitation and spontaneous emission processes may be described as independent. Both frequency-domain and time-domain formulations of the density-matrix approach are developed. The collective atomic-ensemble states are specified in a detailed hyperfine representation, corresponding to successively coupling the individual hyperfine angular momenta F pertaining to the many-electron atoms. A less detailed fine-structure angular-momentum representation may also be used. In the density-operator approach, account can be taken of the coherent excitation of a particular subspace of the initial atomic-ensemble states. For a comprehensive and unified development of time-domain (equation-of-motion) and frequency-domain (resolvent-operator) formulations, a reduced-density-matrix (quantum-open-systems) approach is introduced. The non-equilibrium atomic-ensemble-state kinetics and the homogeneous spectral-line shapes can thereby be systematically and self-consistently determined. The collective atomic-ensemble states may be obtained using a variety of different methods. These states can be determined using a dressed-state approach, in which the required states are calculated in the presence of an electromagnetic field.
Verne Louis Jacobs,
Angular Distribution and Polarization of Superradiant Emission from Atomic Ensembles, World Journal of Applied Physics.
Vol. 5, No. 1,
2020, pp. 1-14.
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