Accession Number : ADD012762

Title :   Differentiating Spatial Light Modulator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Armitage,David

Report Date : 17 Feb 1987

Pagination or Media Count : 6

Abstract : This patent discloses a differentiating spatial light modulator device in which a photoreceptor and an electro-optic crystal are isolated by a dielectric mirror. The electro-optic crystal is configured to have low or zero longitudinal response, yet is sensitive to transverse electric fields. The fringe field generated by the photoreceptor (photodiode) modulates the crystal birefringence. Readout via a polarizing beampslitter gives an output light related to the spatial gradient of the input light. In a liquid crystal embodiment of the invention, reversal of the applied voltage gives a driven off state which speeds the erasure. Storage is possible in the smectic liquid crystal phase.

Descriptors :   *PATENTS, *LIQUID CRYSTALS, *LIGHT MODULATORS, BIREFRINGENCE, DIELECTRICS, ELECTRIC FIELDS, ELECTROOPTICS, GRADIENTS, INPUT, LIGHT, MIRRORS, OUTPUT, PHOTODIODES, PHOTORECEPTORS, SPATIAL DISTRIBUTION, STORAGE, TRANSVERSE, VOLTAGE, BEAM SPLITTING

Subject Categories : Optics
      Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE