Raymond, Elizabeth A. An assessment of the information transfer process for embossed holographic elements Embossed holographic elements, such as diffraction gratings, display holograms and optical discs are now firmly established as mass-replicated items. The embossed hologram has evolved from its original form recorded in emulsion on glass plate to present-day images stamped into plastic. The process of obtaining a holographic image in plastic requires several stages of information transfer: first a surface relief image must be recorded into emulsion; next a metal replica must be made; finally the embossed plastic image is produced. A detailed analysis of the information transfer process has been undertaken and is described. [Continues.] untagged;Mechanical Engineering not elsewhere classified 2018-07-05
    https://repository.lboro.ac.uk/articles/thesis/An_assessment_of_the_information_transfer_process_for_embossed_holographic_elements/9530810