Volume holographic storage using rotated signal beam encoder

Details Volume holographic storage using rotated signal beam encoder Volume holographic storage using rotated signal beam encoder

1998-05-01

2000-03-21

Chang, Audrey

Optical: systems and elements

Holographic system or element

Having defined page composer

359 22, 359 30, 365125, G02B 532, G03H 126, G03H 100, G11C 1304

Patent

active

060409304

ABSTRACT:
The data encoder (e.g. an amplitude spatial light modulator, ASLM) in a volume holographic storage system is rotated by 45.degree. relative to the normal to the plane of the reference and signal beams, such that the near-Fourier transform pattern of the encoder at the medium has an X-shape. The encoder rotation allows tight packing of spatial multiplexing subvolumes in a rectangular array, and provides for uniform spatial frequency filtering in a perpendicular geometry.

REFERENCES:
patent: 4920220 (1990-04-01), Phaff
patent: 5339305 (1994-08-01), Curtis et al.
patent: 5377176 (1994-12-01), Redfield
patent: 5440669 (1995-08-01), Rakuljic et al.
patent: 5450218 (1995-09-01), Heanue et al.
patent: 5483365 (1996-01-01), Pu et al.

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