GENERATION OF LOHMANN IMAGES FROM BINARY-PHASE TALBOT ARRAY ILLUMINATORS

A systematic analysis has been performed that predicts the existence o f 36 cases in which 100% modulated, square-wave irradiance distributio ns can be generated in the Fresnel regime by simple binary phase grati ngs. These types of distributions, referred to here as Lohmann images, have been previously predicted by researchers studying phase gratings known as Talbot array illuminators, Twenty of the cases are reported, to the best of my knowledge, for the first time. Sixteen of these new cases result in Lohmann images with twice the spatial frequency of th e original grating. Experimental verifications of the theoretical pred ictions are presented. (C) 1997 Optical Society of America.