Method for dynamically refreshing angle-multiplexed holograms in

Details Method for dynamically refreshing angle-multiplexed holograms in Method for dynamically refreshing angle-multiplexed holograms in

1995-04-13

1998-02-10

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 7, 359 22, 365125, 369103, G03H 102

Patent

active

057175080

ABSTRACT:
A method and system are disclosed for dynamically refreshing angle-multiplexed holograms stored in a photorefractive medium. In accordance with the invention the photorefractive medium is simultaneously exposed to a plurality of reference beams. Each reference beam is oriented at an angle corresponding to an angle at which a hologram was previously stored within the photorefractive medium. The frequency and duration of the reference beams are regulated such that each reference beam enhances the diffraction efficiency of an associated hologram, stored at the angle corresponding to the angle of the reference beam. Each reference beam is preferably at a frequency different from the frequency of the other reference beams so as to avoid the generation of plane-wave holograms due to interference between the multiple reference beams.

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"Self Enhancement in Lithium Niobate", Optics Communications, vol. 72, No. 3, 4, p. 175 (1989).
"Single-Step Copying Process for Multiplexed Volume Holograms", Optics Letters, vol. 17, No. 9, p. 676 (1992).

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