Medium suitable for recording holograms, comprising I) as a carrier, a stratum of a transparent material or material composite which is transparent to light in the visible spectral range (transmission greater than 85% in the wavelength range of 400 to 780 nm) and may optionally be coated on one or both sides and II) at least one optionally multilayer photopolymer stratum II) applied to the carrier I) and based on polyurethane compositions, comprising A) a polyisocyanate component, B) an isocyanate-reactive component, C) compounds which have groups reacting under the action of actinic radiation with ethylenically unsaturated compounds with polymerization (radiation-curing groups) and which themselves are free of NCO groups, D) photoinitiators E) free radical stabilizers F) optionally catalysts G) optionally auxiliaries and additives, characterized in that the polyurethane compositions of the photopolymer strata II) have a total surface tension which is less than that of the carrier I), including any coatings, where the carrier I) has a birefringence, expressed via the mean optical retardation, of less than 1000 nm, where the retardation is measured using an imaging polarimeter, where the materials or material composites of the carrier layer I) are based on polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, cellulose acetate, cellulose hydrate, cellulose nitrate, cycloolefin polymers, polystyrene, polyepoxides, polysulphone, cellulose triacetate, polyamide, polymethylmethacrylate, polyvinyl chloride, polyvinyl butyral or polydicyclopentadiene or mixtures thereof, and where the polyurethane compositions in component C) comprise one or more compounds of the formulae to: in which R, independently of one another, are in each case a radiation-curable group and X, independently of one another, are in each case a single bond between R and C=O or a linear, branched or cyclic hydrocarbon radical optionally containing heteroatoms and/or optionally substituted by functional groups. I) as a carrier, a stratum of a transparent material or material composite which is transparent to light in the visible spectral range (transmission greater than 85% in the wavelength range of 400 to 780 nm) and may optionally be coated on one or both sides and II) at least one optionally multilayer photopolymer stratum II) applied to the carrier I) and based on polyurethane compositions, comprising A) a polyisocyanate component, B) an isocyanate-reactive component, C) compounds which have groups reacting under the action of actinic radiation with ethylenically unsaturated compounds with polymerization (radiation-curing groups) and which themselves are free of NCO groups, D) photoinitiators E) free radical stabilizers F) optionally catalysts G) optionally auxiliaries and additives, characterized in that the polyurethane compositions of the photopolymer strata II) have a total surface tension which is less than that of the carrier I), including any coatings, where the carrier I) has a birefringence, expressed via the mean optical retardation, of less than 1000 nm, where the retardation is measured using an imaging polarimeter, where the materials or material composites of the carrier layer I) are based on polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, cellulose acetate, cellulose hydrate, cellulose nitrate, cycloolefin polymers, polystyrene, polyepoxides, polysulphone, cellulose triacetate, polyamide, polymethylmethacrylate, polyvinyl chloride, polyvinyl butyral or polydicyclopentadiene or mixtures thereof, and where the polyurethane compositions in component C) comprise one or more compounds of the formulae to: in which R, independently of one another, are in each case a radiation-curable group and X, independently of one another, are in each case a single bond between R and C=O or a linear, branched or cyclic hydrocarbon radical optionally containing heteroatoms and/or optionally substituted by functional groups. A) a polyisocyanate component, B) an isocyanate-reactive component, C) compounds which have groups reacting under the action of actinic radiation with ethylenically unsaturated compounds with polymerization (radiation-curing groups) and which themselves are free of NCO groups, D) photoinitiators E) free radical stabilizers F) optionally catalysts G) optionally auxiliaries and additives, characterized in that the polyurethane compositions of the photopolymer strata II) have a total surface tension which is less than that of the carrier I), including any coatings, where the carrier I) has a birefringence, expressed via the mean optical retardation, of less than 1000 nm, where the retardation is measured using an imaging polarimeter, where the materials or material composites of the carrier layer I) are based on polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, cellulose acetate, cellulose hydrate, cellulose nitrate, cycloolefin polymers, polystyrene, polyepoxides, polysulphone, cellulose triacetate, polyamide, polymethylmethacrylate, polyvinyl chloride, polyvinyl butyral or polydicyclopentadiene or mixtures thereof, and where the polyurethane compositions in component C) comprise one or more compounds of the formulae to: R, independently of one another, are in each case a radiation-curable group and X, independently of one another, are in each case a single bond between R and C=O or a linear, branched or cyclic hydrocarbon radical optionally containing heteroatoms and/or optionally substituted by functional groups.