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弱散射体产生的菲涅耳极深区散斑场相位涡旋演化的实验研究
Experimental study of the evolution of phase vortices in the speckle fields generated by weak scattering screens in the extremely deep Fresnel diffraction region
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摘要: 实验提取了弱散射体产生的菲涅耳极深区的散斑场.发现当散射距离一定时,弱散射体光场的相位分布特征随散射体的粗糙度的变化而变化;对于某一弱散射体,相位分布特征随散射距离的变化而变化;当弱散射体的粗糙度大到一定程度时,才产生相位涡旋现象;散射体表面上存在相位涡旋;弱散射体产生的相位涡旋的密度随散射屏粗糙度的增大而增大,还随散射距离的增大而增大.研究结果对于认识弱散射体的相位及相位涡旋分布特征随粗糙度和散射距离的演化具有重要意义,而且对于认识散斑场随散射距离的演化有一定的帮助.Abstract: The amplitude of speckles which are in the extremely deep Fresnel diffraction region and generated by weak scattering screens is extracted.It is found that when scattering distance is fixed,the property of phase distribution varies with weak scattering screen roughness. For a weak scattering screen,the phase distribution property changes with scattering distance.The phase votex phenomenon does not appear until the surface of weak scattering screen is rough enough.It is interesting that there are phase vortices on scattering screen surface.The phase votex density will rise when scattering screen becomes rougher or scattering distance turns larger.Experimental results are helpful to realize that the phase and the phase votex distribution property vary with roughness of weak scattering screen and scattering distance which lies in the extremely deep Fresnel diffraction region.Moreover,the results contribute to the understanding of the speckle field evolution with scattering distance.
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