The current theory of superradiance is described. The effect is due to interatomic correlations (phase-locking) which arise under the action of a general electromagnetic field and are determined by the competition between the electron motion anharmonicity and the interatomic dipole-dipole interaction. The latter affects significantly the nature of the superradiance effect. A common nature for the radiations from a Dicke atomic ensemble and from collective waves in a substance (for example, cyclotron waves in a magnetized plasma) is established. Superradiance manifests itself in hot magnetically confined plasmas and accounts, among other things, for anomalous heat conductivity in tokamaks.

PACS: 42.50.−p, 42.50.Gy, 42.65.−k, 52.35.−g (all) DOI: 10.1070/pu1999v042n02ABEH000521 URL: https://ufn.ru/en/articles/1999/2/a/ 000079341200001 Citation: Men’shikov L I "Superradiance and related phenomena" Phys. Usp. 42 107 (1999) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Оригинал: Меньшиков Л И «Сверхизлучение и некоторые родственные явления» УФН 169 113–154 (1999); DOI: 10.3367/UFNr.0169.199902a.0113