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Experiments on Superfluorescence in Cesium

  • Q. H. F. Vrehen
  • H. M. J. Hikspoors
  • H. M. Gibbs
Conference paper

Abstract

Superfluorescence (SF), i.e., the cooperative or superradiant[1] emission of an initially inverted system, has been the subject of extensive theoretical investigation[2–9]. The first experiment[10] and its interpretation[11] have aroused further interest in the phenomenon. The SF decay of a pencil-shaped volume of density n is characterized by the emission of a delayed pulse (or pulses) in a narrow cone along the sample axis; the delay time τD is nearly proportional to n−1, the peak power is nearly proportional to n2. The quantitative description of the initial generation of atomic coherence and of the subsequent coherent pulse evolution is still under discussion and so are the precise conditions for SF to occur. Stringent conditions have been specified by Bonifacio and Lugiato[6] for what these authors call “pure SF”: (a) a pure two-level system, (b) a pencil-shaped volume of Fresnel number N ≡ A/λL = 1, (c) transverse excitation with a pump pulse of duration τp ≫ τD, and (d) τE < τC < τR < τD < T1, T’2, T*2.

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Copyright information

© Springer Science+Business Media New York 1978

Authors and Affiliations

  • Q. H. F. Vrehen
    • 1
  • H. M. J. Hikspoors
    • 1
  • H. M. Gibbs
    • 2
  1. 1.Philips Research LaboratoriesEindhovenThe Netherlands
  2. 2.Bell LaboratoriesMurray HillUSA

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