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Electrically tunable, optically induced dynamic and permanent gratings in dye doped liquid crystals

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Figure

Fig. 2.Schematic diagram of experimental geometry to write gratings. The example shows a planar cell with a dye-doped liquid crystal.
Fig. 4.Enhancement of diffraction efficiency with applied ac field inhomeotropic permanent gratings in 2% methyl red-doped 5CB in comparisonto the diffraction efficiency in the absence of an applied field.
Fig. 5.Switching between (a) minimum diffraction and maximum diffraction(b) between maximum and minimum, by changing the amplitude of the ac fieldfrom 2 to 4.5 V (and from 4.5 to 2 V) for 1-kHz ac frequency.

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