1986-07-07
1988-12-27
Arnold, Bruce Y.
350 361, 350320, 350351, G02F 113, G02H 104
Patent
active
047936703
ABSTRACT:
Optical four wave mixing is provided by interfering two waves on a liquid crystal layer (1) temperature stabilized just beneath its nematic/isotropic phase change transition temperature. The liquid crystal incorporates a guest dye to absorb the light producing a holographic thermal image which is accompanied by a holographic phase image. Once this phase image starts to build up it is illuminated with a `third wave` of light that is not absorbed so as to produce the required holographically diffracted `fourth wave`.
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Collings Neil
Crossland William A.
Ross Peter W.
Arnold Bruce Y.
Lerner Martin
STC PLC
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