Single beam write and/or replay of spatial heterodyne holograms

Patent · Tue Nov 20 00:00:00 EST 2007

OSTI ID:919901

Thomas, Clarence E. ^[1]; Hanson, Gregory R. ^[2]

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1. Knoxville, TN
2. Clinton, TN

A method of writing a spatially heterodyne hologram having spatially heterodyne fringes includes: passing a single write beam through a spatial light modulator that digitally modulates said single write beam; and focusing the single write beam at a focal plane of a lens to impose a holographic diffraction grating pattern on the photorefractive crystal, the holographic diffraction grating pattern including the spatially heterodyne hologram having spatially heterodyne fringes, wherein only said single write beam is incident on said photorefractive crystal without a reference beam. A method of replaying a spatially heterodyne hologram having spatially heterodyne fringes at a replay angle includes: illuminating a photorefractive crystal having a holographic diffraction grating with a beam from a laser at an illumination angle, the holographic diffraction grating pattern including the spatially heterodyne hologram having spatially heterodyne fringes, wherein a difference between said illumination angle and said replay angle defines a diffraction angle .alpha. that is a function of a plane wave mathematically added to original object wave phase and amplitude data of said spatially heterodyne hologram having spatially heterodyne fringes.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-96OR22464
• Assignee: UT-Battelle LLC (Oak Ridge, TN)
• Patent Number(s): 7,298,532
• Application Number: 10/166,859
• OSTI ID: 919901
• Resource Relation: Patent File Date: 2002 Jun 11
• Country of Publication: United States
• Language: English