HOLOGRAM

摘要

PURPOSE:To provide the hologram for which decipherment of recorded information is difficult. CONSTITUTION:The photoelectrically readable information 13 is recorded reproducibly by an invisible wavelength 6 specific to an IR region or UV region on the Lippmann hologram 10 recorded with the information 13. The decipherment of the information recorded on the hologram is difficult and the forgery thereof is difficult unless the information on the wavelength of diffracted light 14 for reconstruction is given. Such hologram is, therefore, suitable for security.