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Soviet Journal of Quantum Electronics

Initial stage of a superradiance pulse in the case of delayed or prolonged excitation of matter

V.D. Laptev, N. M. Reutova, I. V. Sokolov

Published Aug 31, 1984• 0 citations
Publisher

Abstract

The delay time of the principal superradiance pulse is found theoretically for the cases when a longitudinal wide-band pump pulse is long on the time scale of the output radiation or when such a pump pulse travels along an active medium more slowly than the optical wave. A comparison is made of the delay times of the forward and reverse waves. A linearized semiclassical problem (one-dimensional case) with a random source is solved for the amplitude of the radiation field.

DOI
10.1070/qe1984v014n08abeh005375

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The delay time of the principal superradiance pulse is found theoretically for the cases when a longitudinal wide-band pump pulse is long on the time scale of the output radiation or when such a pump pulse travels along an active medium more slowly than the optical wave. A comparison is made of the delay times of the forward and reverse waves. A linearized semiclassical problem (one-dimensional case) with a random source is solved for the amplitude of the radiation field.
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The generation of reflected and transmitted waves in induced superradiance is investigated. It is demonstrated that the exponential increase in the amplitude of the total field at the linear stage of the process may be accompanied by a periodic coherent exchange between the forward and backward waves in a sample. Transition to the nonlinear stage in a certain phase of this exchange determines the predominance of the transmitted or reflected wave in the pulse. The influence of the area of the initiating pulse and the sample length is considered.