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Journal of Experimental and Theoretical Physics

Spontaneous coherent responses of many-level systems undergoing a phase transition of the super-radiative type

N. S. Buǐnov, R. A. Vlasov, V. S. Kuz’min, V. R. Nagibarov

Published Jun 1, 1978• 0 citations
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According to the semi classical approximation (neglecting quantum correlations between the field and atoms)we investigate resonant and nonresonant optical effects arising in the two-layer medium that consists of three-level atoms with the A-scheme of optical transitions which are prepared so that they can undergo a super-radiant decay of their electronic states. The analytic regularities related to a linear stage of development of super-radiation in high-frequency optical channels of the medium under consideration are given in the article. Raman effect related to doublet structure of the lower level is analyzed.
Photon statistics are obtained from exact closed-form solutions for both spontaneous and stimulated coherent emissions by a large number of two-level atoms in a Dicke state. Depending on the initial excitation level of the atoms, three types of photon statistics are obtained for the emitted radiation field. Moments of the photon number of the emitted field are calculated in the case of initial atomic coherent states as well as Dicke states, and in the case of n-photon stimulating pulses as well as coherent stimulating pulses. In the particular case of an initial "superradiant" Dicke state stimulated by a coherent-radiation field, the emitted radiation pulse is also fully coherent. In other cases the photon distributions undergo large fluctuations.