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AssigneeHughes Aircraft Company
InventorsJames A. Arns, Timothy J. Edwards, Gaylord E. Moss, John E. Wreede
Estimating the term…
A hologram forming system for forming, from a single beam source and a reflective mirror, a reflective hologram in which spurious reflection and transmission hologram recordings are eliminated. Reflected rays are changed in phase relative to the primary beams during the recording period so that spurious holograms do not form. The remaining effect of the reflected rays is to slightly change the overall refractive index of a phase recording material (such as dichromated gelatin) with a resultant slight loss of available index of modulation or to slightly, uniformly, darken an amplitude hologram film, (such as silver halide) with a slight loss of available contrast. The invention includes hologram forming systems that move the cover plate relative to a fixed recording medium with and without a phase shifter in the primary beam and a hologram forming system that moves the substrate and mirror relative to the fixed cover plate.
A system for recording, during a recording period, a hologram from a source of a single beam while substantially preventing the formation of spurious hologram recordings comprising:
A system for recording a hologram comprising a recording structure including a recording medium positioned between a reflector and a cover plate, means to apply a single beam to said recording structure, and means for changing the phase of rays reflected from said cover plate relative to phase of rays in said beam and the phase of rays reflected from said reflector.
A system for recording a hologram comprising a recording structure including a recording medium positioned between a reflector and a cover plate, means to apply a single beam to said recording structure during a recording period.
Dependencies are inferred from the claim text.