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Physical Review Letters

Cooperative Relaxation in Coherently Pumped Three-Level Systems.

I. R. Senitzky, Jan Genossar

Published Jul 14, 1980• 0 citations
Publisher
DOI
10.1103/physrevlett.45.148.3

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The behavior of a pumped collection of identical three level atoms in which both the upper pair of levels and the lower pair of levels are coupled to resonant cavity-modes is analyzed. The cases of both incoherent pumping and coherent pumping are considered, and turn out to be qualitatively different. For the case of incoherent pumping, field oscillation can be sustained in only one of the modes, the behavior of the system being that of the familar three-level laser, with oscillation occuring between either the upper pair or lower pair of levels, depending on the relaxation constants. For the case of coherent pumping, however, oscillation can be obtained in both modes. Furthermore, this oscillation is different from that found in a parametric oscillator in the sense that, under certain conditions of operation, the phases of oscillation in the two cavities are independent. The potential application of such behavior is pointed out. (Author)

•Sep 1, 1978•0 citations
Numerical researches of the three-level atomic system on supervision of pulse and spectrum dynamics of superfluorescence are carried out at incoherent pumping depending on nonradiation relaxations, on influence of phase relaxations are shown. Pulse and spectrum dynamics of induced superradiation depending on the area and duration of input pulse at incoherent pumping, with and without taking into account phase relaxations, are investigated. Depending on media parameters different modes of induced superradiation are researched.
The behavior of a pumped collection of identical three level atoms in which both the upper pair of levels and the lower pair of levels are coupled to resonant cavity-modes is analyzed. The cases of both incoherent pumping and coherent pumping are considered, and turn out to be qualitatively different. For the case of incoherent pumping, field oscillation can be sustained in only one of the modes, the behavior of the system being that of the familar three-level laser, with oscillation occuring between either the upper pair or lower pair of levels, depending on the relaxation constants. For the case of coherent pumping, however, oscillation can be obtained in both modes. Furthermore, this oscillation is different from that found in a parametric oscillator in the sense that, under certain conditions of operation, the phases of oscillation in the two cavities are independent. The potential application of such behavior is pointed out. (Author)