METHOD OF PRODUCING HOLOGRAM OF DRAWING Russian patent published in 2015 - IPC G03F7/00 

FIELD: physics.

SUBSTANCE: drawing is converted to raster in digital form and information on the amplitude and phase, characterising each raster point, is recorded. The required parameters of elements of the hologram are calculated, for which elements of the digital raster of the image of the drawing are converted to digital raster of the future hologram. A diffraction pattern is calculated at each point of the future hologram. An interference pattern resulting from interaction of the calculated diffraction pattern with the calculated wave front from a virtual reference radiation source is calculated. The transmission function of the hologram is calculated and regions are selected therein, which, after binarisation, yield transparent elements of an unallowable small size, which physically do not transmit light, after which the transmission function is changed to increase the size of said elements. The result is used to form a diffraction structure of the hologram on a carrier and the hologram is created in the form of a set of transparent discrete elements in an opaque layer deposited on a transparent substrate. Optical correction of the enlarged elements is performed to allow the enlarged elements to transmit an amount of light according to the primary transmission function. Correction is performed by placing on the opaque layer a layer of absorbent substance with a known absorption coefficient for the image reconstructing radiation, and the region over the non-enlarged elements is made transparent.

EFFECT: obtaining a drawing with improved process parameters, high contrast of the obtained drawing and low noise level.

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