This article is cited in 17 papers

Physical foundations of quantum electronics

On the propagation velocity of a wave packet in an amplifying medium

N. S. Bukhman

Samara State Academy of Architecture and Construction

Abstract: It is shown that the delay time of a weak signal propagating in an amplifying medium on the wings of the spectral amplification line may be shorter than the time of propagation of the signal with the velocity of light in vacuum. It is found that in this case, the time dependence of the signal is exactly 'reconstructed' at the point of detection, and the detection of the signal continues even if it is abruptly terminated at the point of transmission. It is also shown that using the complex time of group delay of the signal, it is possible to improve the accuracy of the results in the first order of dispersion theory within this approximation.

PACS: 42.25.Bs

Received: 18.04.2001

 English version: Quantum Electronics, 2001, 31:9, 774–780

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