相干光束光的均匀性
Homometry in the light of coherent beams
摘要：
如果两个系统不能用衍射区分，则它们是同度量的。我们首先作出布拉格和漫散射homometry之间的区别，并表明，在最后一种情况下，相干衍射可以使衍射图区分。Rudin-Shapiro序列是随机序列的同度量序列，它的研究允许人们独立地操纵两点和四点关联函数，并显示它们对散斑图统计的影响。讨论了实际材料研究的后果。
英文摘要：
Two systems are homometric if they are indistinguishable by diffraction. We first make a distinction between Bragg and diffuse scattering homometry, and show that in the last case, coherent diffraction can allow the diffraction diagrams to be differentiated. The study of the Rudin-Shapiro sequence, homometric to random sequences, allows one to manipulate independently two-point and four-point correlation functions, and to show their effect on the statistics of speckle patterns. Consequences for the study of real materials is discussed.
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