FIELD: optical instrumentation engineering. SUBSTANCE: layer of hardening polymer adhesive which contains oligoesteracrylate is applied to surface of diffraction optical element - matrix. Dimethacrylate of triethyleneglycol or dimethacrylate of tetraethyleneglycol are used as oligoesteracrylate. Polymer adhesive is additionally injected with initiator of photopolymerization - alkyl ester of benzoine of formula specified in description of invention. Plasticizer in the amount of 1-10 per cent by mass of oligoesteracrylate can be added into polymer adhesive. EFFECT: improved quality of duplicates. 2 cl, 2 tbl
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