UDC 535.1
© Averbukh B. B., 2006
Spatial frequency indicatrix of the nonlinear scattered radiation
The purpose of the present paper is to obtain an indicatrix of the nonlinear scattered radiation in backward direction (reflection) by a system of noninteracting atoms. We consider a uniform indigested distribution of atoms. It is shown that spectral energy of the scattered radiation consists of two different parts. One is the incoherent and isotropic emission of fluorescence. The energy of radiation in this case is proportional to. The other is the collective emission (interference effect). The energy of radiation in this case is spatially focused onto small solid angles about three propagation directions and then is proportional to . We also consider the effect of the sound wave on the spatially – frequency dependent spectrum of the nonlinear reflection.
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