FIELD: printing industry.
SUBSTANCE: method for production of diffraction grating on sheet material from single crystals of metals, their alloys, semiconductors consists in the fact that solution of crystallised materials salt is applied onto sheet material, sheet material is impregnated with this solution, and this material is exposed to pulses of laser radiation, while interference pattern of lines is created on sheet material. At the same time signal crystals are grown along these lines, and a diffraction grating is produced from their combination. Besides in device that realises this method, diffraction grating is created from signal crystals of metals, their alloys, semiconductors, on sheet material placed into natural medium.
EFFECT: creation of reliable counterfeit protection on sheet material, which is identified in ultraviolet, visible and infrared parts of spectrum.
4 cl, 2 dwg
