Hologram recording device, hologram reproduction device,...

Details Hologram recording device, hologram reproduction device,... Hologram recording device, hologram reproduction device,...

2005-11-18

2009-02-10

Chang, Audrey Y (Department: 2872)

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

C359S022000, C359S035000

Reexamination Certificate

active

07489427

ABSTRACT:
In recording of an interference fringe of a reference beam and a signal beam in a hologram recording medium, at the time of multiple recording of holograms in the same recording region by varying the angle of incidence of the reference beam on the hologram recording medium, the angular pitch of the incidence angle of the reference beam is varied according to the incidence angle of the reference beam in the manner of Δθ1, Δθ2, . . . , Δθm−1, and is thereby set to a minimum in such a range as not to worsen crosstalk. This makes it possible to increase the degree of multiplexing when the movable angle of the reference beam is the same, and to narrow the movable angle of the reference beam when the degree of multiplexing is the same, as compared with the related art.

REFERENCES:
patent: 5120621 (1992-06-01), Ramsbottom
patent: 5777760 (1998-07-01), Hays et al.

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