Abstract
Temporal characteristics of the reflected radiation intensity in the case of a nonstationary light beam incident at grazing angles upon a semi-infinite medium with large-scale scattering centers are investigated. The problem of small-angle light reflection is solved within the Fokker–Planck approximation. An analytical expression for the reflected radiation intensity is obtained. Temporal characteristics of the reflected radiation are investigated in detail for the most important cases of incident beam modulation: δ pulse, a sequence of rectangular pulses of different duty factors, and a harmonically modulated light signal. The transition mode for different grazing angles and parameters of the scattering medium has been investigated explicitly. Thus, for example, the characteristic transition time to the stationary mode is calculated for irradiation of the medium with a steplike light pulse.
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