Light Scattering of Laser Beams by Random Micro-Inhomogeneities in Glasses and Polymers

概要

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Electromagnetic scattering of Gaussian laser beams by microheterogeneities in materials such as glasses and polymers is discussed at several wavelengths. The intensity distribution of scattering is derived by statistical theory with the help of correlation functions of inhomogeneities. It is shown that forward and backward scatterings depend on the beam width of the incident laser beam and the ratio of the correlation length of inhomogeneities to the wavelength. Long correlation lengths of inhomogeneities in comparison with wavelengths lead to sharp forward scattering with the small half intensity angle. Scattering pattern of short correlation lengths, on the other hand, is nearly non-directional. The half intensity angle of forward scattering decreases, with the beam width of the incident beam, while the half intensity angle of backward scattering is almost independent of beam width. This scattering theory of Gaussian beam gives fundamental characteristics for laser light scattering measurements in laboratories and can also be applied to evaluate back scattering in laser radars.
社団法人応用物理学会の論文
1974-08-05