Issues

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1976

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February

  

Methodological notes


Propagation of pulses

The propagation of pulsed wave fields in a homogeneous medium or in a homogeneous line with known dispersion law and damping can be regarded from the ray, wave, and energy points of view. The review describes the most significant theoretical results on one-dimensional pulse propagation, using all three approaches. Greatest attention is paid to the principal part of a high-frequency pulse, the part governed by frequencies closest to the pulse carrier frequency. Paradoxes pertaining to superluminal and negative ``group velocities'' are resolved, and questions connected with amplification or attenuation of waves in wave beams and active media are discussed.

PACS: 03.40.Kf
DOI: 10.1070/PU1976v019n02ABEH005138
URL: https://ufn.ru/en/articles/1976/2/h/
Citation: Vainshtein L A "Propagation of pulses" Sov. Phys. Usp. 19 189–205 (1976)
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Оригинал: Вайнштейн Л А «Распространение импульсов» УФН 118 339–367 (1976); DOI: 10.3367/UFNr.0118.197602h.0339

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