Polaroid Corporation

Aprilis, Inc.

M Glenn Horner

David A Waldman

Richard T Ingwall

A hybrid data storage system comprising at least one memory system and at least one holographic drive, data being transmitted between the holographic drive and the memory system. At least one holographic drive writes data to a first holographic recording medium, and reads the written data from said first recording medium and from at least one other holographic recording medium.

Hybrid data storage system

A high-efficiency holographic diffuser is provided, the holographic diffuser being comparatively thin, yet characterized by good optical density along a broad bandwidth. In particular, the high-efficiency holographic diffuser comprises a light-transmissive substrate; and a planar hologram layer, the planar hologram layer having an interference pattern holographically recorded therein, the interference pattern producing a diffuse light pattern in reflection when irradiated with light, the interference pattern being resultant of the combination of an incident wavefront and a counterpropagating wavefront substantially coherent with the incident wavefront, the incident coherent wavefront having impinged upon the planar hologram layer from a first side, the counterpropagating coherent wavefront having impinged upon the planar hologram layer from a second side opposite the first side, the incident coherent wavefront being a diffused coherent wavefront, the counterpropagating coherent wavefront also being a diffused coherent wavefront. The high-efficiency holographic diffuser can be formed by diffusing a coherent wavefront prior to its incidence on a holographic recording medium, transmitting the diffused wavefront through the holographic recording medium, then reflecting the transmitted diffused wavefront with a highly reflective optical element back through the holographic recording medium.

Growing community of inventors

W. Roxbury, MA, United States of America

M Glenn Horner