Optical: systems and elements – Holographic system or element – For synthetically generating a hologram
Reexamination Certificate
2007-11-20
2007-11-20
Chang, Audrey (Department: 2872)
Optical: systems and elements
Holographic system or element
For synthetically generating a hologram
C359S001000, C430S001000
Reexamination Certificate
active
10166859
ABSTRACT:
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 α 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.
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Hanson Gregory R.
Thomas Clarence E.
Bruckner PC John
Chang Audrey
UT-Battelle LLC
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