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  • Hologram Recording Medium (US 7385740)

Photonics Spectra
Oct 2008
A hologram recording medium has been invented. It has a recording layer at which, when illuminated by writing light, a hologram is recorded. On top of the recording layer is a protective layer with a water absorbency of ≤0.01%, which improves the medium’s raw storability.

Applications: Anticounterfeiting security device; identification for authentication (fingerprint, iris).

Assignee: Fuji Xerox Co. Ltd. (Tokyo)

Inventors: K. Haga, K. Hayashi, K. Kawano, H. Yoshizawa, J. Minabe, Y. Ogasawara, S. Yasuda and N. Matsui

Filing/Publication Date: 08-17-05/06-10-08

An interference pattern that is recorded on a high-resolution plate, the two interfering beams formed by a coherent beam from a laser and light scattered by an object. If after processing, the plate is viewed correctly by monochromatic light, a three-dimensional image of the object is seen.  
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