Random Encoded Reference Beam for Secure Data Storage in a Holographic Memory

摘要

A method is presented to store tiometric and/or other important information on an ID card in the form of a Card Hologram that cannot be read or duplicated without the use of a special Key Hologram that is secured inside of an automated reader. The Key Hologram produces the unique wavefront requried to release the information contained in a complex, 3-D diffraction pattern recorded in a volume hologram attached to the card. Experimental results are presented in which the image of an Air Force resolution target are recorded and reconstructed in a volume material using a random speckle wavefront and that cannot be viewed using a simple wavefornt such as a collimated or diverging laser beam.