Amorphous copolymers for photorefractive compounds used in optical signal processing
AssigneeThomson-CSF
InventorsPierre LeBarny, Dominique Broussoux, Jean-Claude DuBois
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Abstract
The invention is a series of amorphous copolymers which, used in association with a small molecule, provide photorefractive materials that can be used in optical signal processing. These copolymers contain an active non-linear optical group and a group which contributes to their photoconductivity. ##STR1## where: X is H, CH.sub.3, Cl or F Y is H, CH.sub.3, Cl or F 2.ltoreq.n.ltoreq.4 2.ltoreq.m.ltoreq.4 The electron-donor group D being: --O--, --S--, ##STR2## or --COO-- The electron-accepter group A.sub.e being: --CN, --NO.sub.2, ##STR3##
Claims3
A photorefractive mixture of organic compounds consisting of an amorphous copolymer for photorefractive compounds having the following chemical formula:
- ##STR9## where:
- X=H, CH.sub.3, Cl or F
- Y=H, CH.sub.3, Cl or F
- .ltoreq. n.ltoreq.4
- 2.ltoreq.m.ltoreq.4
- D is an electron donor group being --O--, --S--, ##STR10## where 0.ltoreq.p.ltoreq.3, or --COO-- A.sub.e is an electron-acceptor group being --CN, --NO.sub.2, ##STR11## ##STR12## is a system rich in .pi. conjugated electrons:
- ##STR13## and a small electron-acceptor molecule C, the molar ratio of electron donor groups D to small electron-acceptor molecules C being between 0 and 1.
Dependencies are inferred from the claim text.