部分相干光栅衍射效应和干涉术

本文提出一种新的部分相干照明的光栅衍射干涉仪.先分析了光栅的介于Talbot和Lan效应之间的部分相干衍射效应.部分相干干涉图的特点是条纹由频率成倍的两种光栅状载波所表征.调整光源狭缝,系统在两相干性极端分别转成Talbot和Lau干涉仪.理论分析采用了模糊函数方法.最后给出了实验.

Grating-diffraction effect and interferometry with partially coherent illumination

In this paper, a new grating-diffraction interferometry with partially coherent illumination is proposed. As a foundation, the partially coherent diffraction effect of gratings between the Talbot and the Lau effects is firstly treated. A new type of interferogram is resulted in such a new interferometer, that is characterized by two gratinglike carriers of doubled spatial frequency. Simply by the adjust-ment of the source slit the interferometer will become the Talbot interferometer and the Lan interferometer, respectively, at the two extremes of illumination coherence. The performance of the system is analysed by the ambiguity function. Experiments are given too.