Superradiance: the Approach of Electrodynamics of Continuous Active Media

  • V. V. Zheleznyakov
  • Vl. V. Kocharovsky
  • Vl. V. Kocharovsky
Part of the Research Reports in Physics book series (RESREPORTS)

Abstract

Collective spontaneous radiation (superradiance) of a limited system of oscillators is described by the methods of electrodynamics of continuous active media. It is shown that this phenomenon, known as the Dicke’s superradiance in quantum electrodynamics of two-level oscillators, results from the dissipative instability of negative-energy waves (modes) in excited medium without noncoherent relaxation of polarization of the oscillators. The phenomenon is due to the energy loss by electromagnetic radiation into the ambient space. It is found that superradiance can occur not only in a system of quantum (two-level) oscillators but also in a system of classical oscillators. Cyclotron superradiance of electron flow in magnetic field under the anomalous Doppler effect is considered. Basic peculiarities of the nonlinear dynamics of the Dicke’s superradiance and cyclotron superradiance are presented.

Keywords

Microwave Coherence 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • V. V. Zheleznyakov
    • 1
  • Vl. V. Kocharovsky
    • 1
  • Vl. V. Kocharovsky
    • 1
  1. 1.Institute of Applied PhysicsUSSR Academy of SciencesGorkyUSSR

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