Surface relief holographic recording medium and optical system for its reading

摘要

A surface relief holographic recording medium is described, in particular a foil, comprising digital data, wherein the holographic recording medium is a holographic material for recording surface relief holograms (1), in particular by providing a fringe pattern (3). To provide a surface relief hologram which is more difficult to counterfeit, the digital data are recorded with a holographic fringe period being sufficiently small such that the diffracted light from the digital data cannot be seen by human eye. Further, an optical system for reading this hologram is described.