a Theory of Cooperative Emission from Two-Level Atoms.

V. I. Rupasov, Vladimir I. Yudson

Vladimír Bužek

Jamal T. Manassah

The values of the radii of the sphere enclosing an ensemble of two-level atoms corresponding to metastable states in the cooperative emission are computed. The dynamics of these states and, in particular, the delay in the maximum of the emission intensity are given for the different orders of the critical radii. 1 The article is published in the original.

H. J. Carmichael

Kensuke S. Ikeda, Jumpei Okada, Masahiro Matsuoka

The characteristics of the cooperative cascade emission is studied by taking into account of the nonlinearity due to depopulation. It is shown that the emitted radiation exhibits considerably different behaviors in three regimes of the atomic number density. In the lowest density regime the radiation is essentially a quasi-stationary amplified spontaneous emission (ASE), in the intermediate one it becomes superradiant, and in the highest one it shows a new cooperative behavior peculiar to the cascade system. By using the present theory the experimental results recently observed in Li vapour is explained. It is also shown that the present theory describes the two-level cooperative emission as a specific limiting case.

Dmitri Smirnov, I. V. Sokolov, Evgenii Dmitrievich Trifonov