Abstract
The results of calculation of the mean intensity of spatially partially coherent pulsed optical beam scattered by an atmospheric layer are presented. It is shown that in contrast to cw radiation, which scatters uniformly, the scatter of pulsed beam becomes nonuniform for shorter pulses. For the femtosecond pulse duration the backscattered radiation is localized near the strictly backward direction in the area with transverse dimensions comparable with the initial size of the sensing beam.
Highlights
The diffractive broadening of broadband pulsed optical beams as a function of the pulse duration has been studied in [1,2,3,4,5], and it has been shown that as the pulse duration decreases, the diffractive broadening of the beam becomes smaller than that of continuous wave beams
Let a laser beam of pulsed radiation with the initial complex amplitude distribution U(0,ρ,t) after propagation of the path L in the direction of the Z axis in the atmosphere is scattered by an atmospheric layer
The backscattered radiation is received by a photodetector in the plane Z = 0
Summary
The diffractive broadening of broadband pulsed optical beams as a function of the pulse duration has been studied in [1,2,3,4,5], and it has been shown that as the pulse duration decreases, the diffractive broadening of the beam becomes smaller than that of continuous wave (cw) beams. 2. METHODOLOGY Let a laser beam of pulsed radiation with the initial complex amplitude distribution U(0,ρ,t) after propagation of the path L in the direction of the Z axis in the atmosphere is scattered by an atmospheric layer.
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