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Experimental aspects of transition phenomena in quantum optics

  • F. T. Arecchi
Systems far away from Equilibrium
Part of the Lecture Notes in Physics book series (LNP, volume 104)

Abstract

Phase transitions in equilibrium systems are the result of a competition between the interparticle energy J and the thermal energy kBT which introduces disorder. In quantum optics, even when interparticle interactions are negligible as in a very dilute gas, there may be particle correlations due to the common radiation field. The transition from disorder to order consists in a passage from a regime where the atoms emit independently from one another, to a regime where the atoms emit in a strongly correlated way. It depends on a “cooperation number” C which is proportional to the atomic density. In a “pumped” system, as the density of active atoms is increased, the laser threshold is reached for C=1 and the coherent e.m. intensity is proportional to C-1.

The laser threshold and the optical bistability are discussed as examples, respectively, of 2nd and 1st order phase transitions in quantum optics. By photon statistics methods the statistical features of these phenomena can be measured with high accuracy.

Furthermore, in nonequilibrium optical systems it has been possible to study for the first time the transient build-up of an ordered state by a rapid passage through an instability. These transients are characterized by large fluctuations which display a scaling behaviour.

Keywords

Order Phase Transition Photon Number Laser Field Saturable Absorber Laser Threshold 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • F. T. Arecchi
    • 1
  1. 1.Università di Firenze and Istituto Nazionale di OtticaFirenze

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