Process for photorefractive index grating formation
AssigneeInternational Business Machines Corporation
InventorsGary Carl Bjorklund, William Esco Moerner, Scott Meixner Silence
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Abstract
The present invention relates to an improved process for photorefractive index grating formation utilizing polymeric photorefractive materials. The process involves the steps of: (i) exposing a polymeric optical article to electromagnetic radiation having an intensity of at least 0.05 W/cm2 for a short period of time to achieve an absorbed energy/unit volume of at least 1×103 J/cm3 to activate the article, and (ii) exposing the polymeric optical article to an electric field and electromagnetic radiation to form an index grating.
Claims8
A process for holographic storage in a photorefractive polymeric optical article comprising a polymer and a non linear optical chromophore comprising the steps of (i) exposing the article to electromagnetic radiation having an intensity of at least 0.05 W/cm2 to obtain an absorbed energy/unit volume of at least 1×104 J/cm3 from said radiation to activate the article without forming an index grating and (ii) exposing said article to an external electric field and electromagnetic radiation to cause formation of an index grating provided one of the step (i) or step (ii) exposures is with two intersecting beams of coherent electromagnetic radiation and the other step exposure is a flood exposure.
Dependencies are inferred from the claim text.