Abstract: Temporal characteristics of reflected radiation intensity while nonstationary light beam is incident at grazing angles upon the semi infinite medium with large scale scattering centers are investigated. The problem of small-angle light reflection is solved within the FOKKER - PLANK approximation. The analytical expression for reflected radiation intensity is obtained. Temporal characteristics of reflected radiation are investigated in detail in the most important cases of modulation of incident beam:$epsilon@-puls, the sequence of rectangular pulses of different duty factors and harmonically modulated light signal. !13
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