Plessey Handel Und Investments A.g.

Peter Waterworth

Douglas Charles Reid

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

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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Towcester, United Kingdom

Peter Waterworth