Method for recording and reproducing a hologram and...

Details Method for recording and reproducing a hologram and... Method for recording and reproducing a hologram and...

2006-03-13

2010-12-28

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112240

Reexamination Certificate

active

07859973

ABSTRACT:
A hologram recording method is a method of recording a hologram, on a hologram recording apparatus that records information by forming a diffraction grating through oppositely irradiating the signal beam and the reference beam to the hologram record carrier. The hologram recording method includes a step of focusing the reference beam at a first numerical aperture from a first effective diameter by means of the reference-beam objective lens, a step of separating the reference beam in a part on the optical axis and a neighborhood thereof to thereby produce from the reference beam a recording reference beam to passes through the hologram record carrier at a second numerical aperture smaller than the first numerical aperture from a second effective diameter smaller than the first effective diameter by means of the reference-beam objective lens of the reference-beam optical system, and allowing the recording reference beam to exit coaxially to the reference beam, and a step of not allowing only the recording reference beam to exit toward the hologram record carrier by means of the signal-beam optical system.

REFERENCES:
patent: 2002/0015376 (2002-02-01), Liu et al.
patent: 11-311938 (1999-11-01), None
patent: 2002-123948 (2002-04-01), None
patent: 2005-122867 (2005-05-01), None
patent: 2004-134721 (2007-04-01), None
patent: 2004-286883 (2007-10-01), None
patent: 02/05270 (2002-01-01), None

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