Diffraction efficiency of a phase hologram formed by surface deformation

The results are given of theoret ical and experimental investigations of light-sensitive films on which information was recorded by altering the shape of the film surface. Calculations are given of the brightness of the diffraction fringes as a function of the deformation of one- and two-dimensional gratings. The experiments were carried out on films of dichromated gelatin. The agreement between the theoretical and the experimental results was satisfactory.