A method for fabrication of a microlens raster with full filling on photographic plates PFG-01 is proposed. A twodimensional holographic crossed grating (TDHG) with improved imaging properties is used as an image multiplying optical element. In order to create the improved TDHG, we have proposed a special technique for photographic emulsion layer treatment. The light intensity distribution from the display image was projected onto a light-sensitive material using the TDHG. After the development of the photographic plates, either hardening bleaching or short-wave ultra-violet illumination is used for relief creation.Keywords: silver-halide photographic emulsion, holographic optical elements, microlens raster
TWO-DIMENSIONAL CROSSED HOLOGRAPHUC GRATING FOR RASTER IMAGE CREATIONWe have previously considered the two-dimensional crossed holographic grating as an optical element having the ability to create raster images. [1] The 2-D crossed grating can be easily obtained by double recording an interference pattern of two plane waves propagating at a certain angle to each other in silver-halide photographic material. In this case, a photographic plate should be rotated in its plane by 90º between two exposures. It is shown that distribution of the total light energy near any minimum is a function with a rotational symmetry with respect to the coordinate point of this minimum.(1)In the limiting case, the 2-D holographic gratings for photographic material having the absolute contrast after development and fixing will represent repeated rows of circular transparent apertures over a dark background, whereas during the chemical development process the boundaries of circular transmitting apertures are practically smeared out (Fig. 1а).To the first approximation, the TDHG can be considered as a set of cameras obscura with apertures of the diameter d A capable of forming serially repeated images in a light-sensitive medium placed at a certain distance z from the TDHG. The required profile of the total energy distribution of light-sensitive medium exposure (depending on coordinates on the medium surface) can be obtained when illuminating it through the TDHG by a parallel beam at different angles to the grating surface normal. Here either continuous exposure or a set of discrete exposures can be used. For example, in order to form a microlens raster, a light-sensitive medium with a relief-phase response can be used. In this case, the distribution profile of the total energy exposure that is formed by the TDHG should be lens-like.Let us consider the TDHG formation for obtaining the raster of convergence microlenses. The most simple way is to * nina.