Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1996-03-12
1998-02-24
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 10, 359 28, 430 1, 430 2, G02B 532, G03H 110, G03H 102, G03H 104
Patent
active
057216304
ABSTRACT:
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.
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Horner M. Glenn
Waldman David A.
Chang Audrey
de Luna Renato M.
Dzierzynski Paul M.
Polaroid Corporation
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