Optical: systems and elements – Holographic system or element – Having defined page composer
Reexamination Certificate
2011-08-02
2011-08-02
Amari, Alessandro (Department: 2872)
Optical: systems and elements
Holographic system or element
Having defined page composer
C359S029000
Reexamination Certificate
active
07990594
ABSTRACT:
The present invention relates to a phase mask for holographic data storage, and to a method and an apparatus for reading from and/or writing to holographic storage media using such a phase mask.According to the invention, the phase mask has a plurality of phase cells, whose size is equal to an integer multiple of the size of the pixels of a spatial light modulator of the apparatus. The phase cells have a phase variation on sub-cell scale, which is inverse for essentially half the number of phase cells.
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Search Report Dec. 11, 2007.
The Institution of Electrical Engineers, Stevenage, GB.; (Jan. 15, 1980), Iwamoto A: “Artificial diffuser for Fourier transform hologram recording” XP002461933 Database accession No. 1511793 p. 219; figure 4 & Applied Optics USA, vol. 19, No. 2. (Jan. 15, 1980), pp. 215-221, ISSN: 0003-6935.
Knittel Joachim
Przygodda Frank
Amari Alessandro
Opalach Joseph J.
Schaefer Jerome G.
Shedd Robert D.
Thomson Licensing
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