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US 4,028,104 AGranted
Infrared hologram recording method
AssigneeHughes Aircraft Company
InventorAndrejs Graube
Life of this patent
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Abstract
A process is disclosed whereby infrared holograms can be recorded in photographic silver halide emulsions as positive images. High resolution holograms have been produced with 1.06 .mu.m radiation in photographic plates by utilizing the Herschel reversal effect.
Claims7
A method of fabricating infrared holograms from silver halide emulsion photographic plates or films comprising, first exposing said plates to visible light, second uniformly exposing said plates or films to holographic infrared radiation and developing said exposed plates or films.
A method of fabricating infrared holograms comprising the steps of:
- a. uniformly exposing a photographic plate or film, comprised of a silver halide emulsion, to visible light whereby the sensitivity of said film or plate is extended to 1 + 0.25 .mu.m wavelength range,
- b. subsequently subjecting said plate or film to a holographic infrared radiation exposure until the desired optical density reduction is achieved, and
- c. developing said exposed plate.
Dependencies are inferred from the claim text.