Hologram erasing method and hologram erasing apparatus

Details Hologram erasing method and hologram erasing apparatus Hologram erasing method and hologram erasing apparatus

2008-09-16

2008-09-16

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

10782758

ABSTRACT:
The present invention discloses a hologram erasing method, in which a predetermined hologram is erased by irradiating a predetermined region of a hologram recording medium in which the hologram to be erased is recorded with a reference light beam and a signal light beam holding a random data pattern at the same time. In this method, the signal light beam and the reference light beam interfere with each other in the medium, and a Fourier transform hologram recorded in the region where the interference occurs is destroyed and erased by interference light beam. That is, a data page for erasing including a random pattern is overwritten to erase an original data page. According to the present invention, the hologram recorded in the optical recording medium can be selectively and completely erased in a simple method.

REFERENCES:
patent: 5838467 (1998-11-01), Curtis et al.
patent: 6281993 (2001-08-01), Bernal et al.
patent: 6721076 (2004-04-01), King et al.
patent: 2001/0002895 (2001-06-01), Kawano et al.
patent: A 2001-147634 (2001-05-01), None
patent: A 2002-268102 (2002-09-01), None
patent: A 2003-030926 (2003-01-01), None
Moser, Christophe, and Demetri Psaltis, Holographic Memory with Localized Recording, Aug. 10, 2001, Applied Optics, vol. 40, No. 23, pp. 3909-3914.

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