摘要
利用多针孔孔径随机散射屏详细分析了夫琅禾费衍射区的散斑场中的相位和相位涡旋的统计特性,发现散斑相位涡旋的分布具有区域相似性和团簇现象,其中有2个、4个和6个正负相位涡旋形成的独立单元。这些新现象与普通单一孔径形成的散斑相位涡旋的分布完全不同。改变随机散射屏前孔径上小针孔的数量和间距,散斑颗粒和相位涡旋的密度随着改变。
By the use of multi-pinhole random screens, the intensity and phase distributions of speckle fields are analyzed. It is found that the distribution of phase vortices shows local similarity and the cluster phenomena appearing in local regions. There are many independent units composed by 2, 4 and 6 positive and negative phase vortices. These new phenomena are different from those generated by a single square aperture random screen. The density of phase vortices becomes larger with the increase of the distance between pinholes and the number of pinholes.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第12期253-258,共6页
Acta Optica Sinica
基金
国家自然科学基金(11404179)
关键词
物理光学
成像系统
衍射
physical optics
imaging systems
diffraction
