Lau effect of the plane-periodic object

Based on the cross-spectral density function, this paper discussed the Lau effect of the plane-periodic object. First, we derived the light intensity distribution of the Lau image of the general plane-object,, then that of the Lau image of the plane-periodic object and the Lau imaging conditions. These coditions contain the Lau Separation and the angle restricted condition. Finally we give out the experimental results.