Abstract
We investigate the intensity and coherence modulation of the far-zone scattered field generated by scattering of multi-Gaussian Schell-model beams from a quasi-homogeneous medium with adjustable boundary. The influences of the scatterer parameters and the beam parameters on the scattered field have been illustrated in detail by numerical simulations. The results indicate that the correlation length of the medium is the key to determine whether the beam or the scatterer plays a leading role in the modulation of the scattered field. When the value of the correlation length of the medium is on the order of the wavelength, the modulation is dominated by the scatterer, while in the case of the value being much larger than the wavelength, the scatterer-led modulation is transformed into the beam-led modulation. Besides, during the transformation process there is a critical value of the correlation length of the medium for the beam to dominate the modulation, and the correlation width of the beam has an impact on the critical value.
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