Plessey Handel Und Investments A.g.

Douglas Charles Reid

Peter Waterworth

A holographic data storage system for the storage and retrieval of data which includes in combination input means adapted to produce a number of coherent beams; wavefront matching means comprising at least one cylindrical lens for facilitating the discrimination of date; a storage medium adapted to store a number of data tracks, and capable of movement in a plane perpendicular to the plane of incidence; stepping means which is adapted to direct the number of beams produced by the input means on to the storage medium in a manner whereby a number of data tracks are recorded or retrieved, and read out means capable of controllable selective retrieval of date.

Holographic data storage systems

This invention relates to an optical system for the production of a beam of light having a uniform intensity distribution. The optical system includes at least one Fresnel biprism for converting a beam of light having a non-uniform intensity distribution into a beam of light having a uniform intensity distribution.

Optical system for the production of a beam of light having a uniform

A scanning system which includes a rotatable multifaceted polygon, the faceted surfaces of which are optically reflective; a recording means spaced-apart from the said polygon and adapted to move in a direction parallel to the rotational axis of the polygon; light generating means for generating at least one pair of light beams, the light beams of each pair being directed at different angles onto the faceted surface in a manner whereby the regions of the faceted surface illuminated by the beams are in contact with each other in a non-overlapping relationship; modulating means for modulating the said at least one pair of light beams; and focussing means interposed between the said polygon and the said recording means for focussing each pair of light beams reflected from the said polygon onto the said recording means.

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St. James, United Kingdom

Douglas Charles Reid