Being interested in the diffraction of a coherent laser close to the diffraction grating, I find nowhere what the pattern looks like relatively to the distance between a diffraction grating and the screen (I'm ok with Fraunhofer diffraction).

I found here the name of the different regimes : http://optics.hanyang.ac.kr/~shsong/4-Fresnel%20and%20Fraunhofer%20diffraction.pdf but I still don't understand this "very near field" behavior (although the far-field diffraction appears every-where)...

Can someone help me understand what does this close to the grating diffraction look like (and if possible show me picture) ?


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