Method of reading a fourier hologram recorded on a...

Details Method of reading a fourier hologram recorded on a... Method of reading a fourier hologram recorded on a...

2011-06-28

2011-06-28

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

C369S044110

Reexamination Certificate

active

07969849

ABSTRACT:
The invention relates to a method for reading a Fourier hologram recorded on a holographic storage medium with a holographic storage system. The method comprises the steps of: —calculating a characteristic value from a detected image of a reconstructed Fourier hologram in at least two relative positions of a reference beam and said storage medium, each of the characteristic values being indicative of a misalignment of the reference beam and said storage medium at the respective relative position, —calculating a servo value from the measured characteristic values, —determining an aligned relative position of said reference beam and said storage medium by means of a predetermined servo function using the calculated servo value, —setting the relative position of the reference beam and said storage medium to said aligned relative position, and—detecting an image at said aligned relative position. The invention also relates to a holographic storage system for reading a Fourier hologram recorded on a holographic storage medium, said system comprising reference beam generating means, storage medium receiving means and a detector for detecting a reconstructed hologram. The system further comprises a servo control unit for executing the method according to the invention.

REFERENCES:
patent: 7116626 (2006-10-01), Woods et al.
patent: 2004/0212859 (2004-10-01), Tsukagoshi
patent: 2006/0133249 (2006-06-01), Kogure
patent: 2006/0181999 (2006-08-01), Knittel et al.
patent: 2008/0008076 (2008-01-01), Raguin et al.
patent: 1 492 095 (2004-12-01), None
patent: 1492095 (2004-12-01), None
patent: 02/05270 (2002-01-01), None
patent: 2005/103842 (2005-11-01), None
International Search Report of PCT/EP2008/000517, dated Mar. 28, 2008 (3 pages).
Lorincz et al., “New results in holographic data storage with organic polymer films,” in Organic Holographic Materials and Applications II, edited by Klaus Merholz, Proceedings of SPIE (2004) vol. 5521, Bellingham, WA.
Suto et al., “Optimisation of data density in Fourier holographic system using spatial filtering and sparse modulation coding,” in Optik 115, (2004) No. 12, 541-546.

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