Differentiating spatial light modulator

Details Differentiating spatial light modulator Differentiating spatial light modulator

1985-04-11

1987-02-17

Evans, Arthur G.

350354, G01F 113

Patent

active

046435336

ABSTRACT:
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) modultes the crystal birefringence. Readout via a polarizing beamsplitter 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.

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