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4 papers
Scattered radiation
Statistic and coherent properties of scattered light fields for different geometrical parameters of rough surfaces
P. A. Bakut,
V. I. Mandrosov Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow region
Abstract:
The relation between the correlation and coherent properties of light fields scattered by rough surfaces and the geometrical parameters of these surfaces is analysed. It is shown that, if the coherence time of illuminating radiation is τ
c>10ω
0 (where ω
0 is the central frequency of the emission spectrum), then, by averaging the field intensity scattered by a rough surface over time
T>10τ
c , we can determine the stationary regions and coherent parameters of the scattered field and the conditions imposed on the narrowband and chromatic (spectral) parameters of illuminating radiation. These regions, parameters, and conditions are specified by the following parameters: the coherence length
Lc=τ
cc of illuminating radiation, the transverse size
d of the backscattering region of the surface, the depth
Ls of the backscattering region, the distance
rc from a receiving aperture to the surface, the size
dρ of the receiving aperture, the central wavelength λ
0=
c/ω
0 of illuminating radiation, and the root-mean-square deviation σ of the height of irregularities of the surface. The obtained results give the relations between
Lc ,
Ls , and σ at which illuminating radiation behaves as monochromatic, quasi-monochromatic or polychromatic radiation and the scattered field behaves as coherent, partially coherent or incoherent field.
PACS:
42.25.Fx,
42.25.Kb Received: 25.10.2005