Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik
Doi
Abstract
This paper discusses the features of transient radiation from periodic
one-dimensional resonant medium excited by ultrashort pulse. The case of
circular geometry is considered for the harmonic distribution of the density
of the particles along the circle. It is shown that a new frequency component
arises in the spectrum of the scattered radiation in addition to the
resonance frequency of medium. The new frequency appears both in the case of
linear and nonlinear interaction, its value depends on the velocity of
excitation pulse propagation and on the period of spatial modulation. In
addition, the case when excitation moves at superluminal velocity and
Cherenkov radiation arises is also studied