Apparatus for holographic data storage

Details Apparatus for holographic data storage Apparatus for holographic data storage

1998-07-16

1999-11-30

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

Having optical element between object and recording medium

359 22, 359 29, 365125, 369103, G03H 100

Patent

active

059952512

ABSTRACT:
A holographic data storage apparatus having no readout lens. The apparatus has a spatial light modulator (SLM), a focusing element such as a lens, a holographic data storage material and a spatial light detector such as a CCD. The lens is located between the SLM and CCD such that the SLM is imaged onto the CCD (i.e. the positions of the SLM, lens, and CCD satisfy the lens equation). The holographic storage material is located between the lens and CCD. Preferably, the storage material is located centered upon a Fourier plane of the lens. In this case, the apparatus also has a phase mask located adjacent to the SLM. Alternatively, the storage material is located a distance away from the Fourier plane or is not centered on the Fourier plane. In yet another embodiment, the holographic storage material is located in contact with the CCD.

REFERENCES:
patent: 5128693 (1992-07-01), Tatemichi et al.
patent: 5519651 (1996-05-01), Redfield
patent: 5719691 (1998-02-01), Curtis et al.
patent: 5838469 (1998-11-01), Campbell et al.

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