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Two beam coupling gain coefficient in reflection grating geometry as a function of the applied electric field for -polarized optical waves at . The solid lines correspond to a quadratic increase of the gain coefficient.
A schematic diagram of the HOMO energy levels of the PPT-TPA photoconductive polymer, the PDCST and DDCST chromophores relative to the HOMO level of the PPT-CZ photoconductive polymer.
Response rate per unit intensity as a function of the applied electric field (on a square-root scale) at a fringe spacing of and .
Specific photoconductivity , conductivity contrast (see text) recalculated for the intensity used in the two-wave mixing measurements, two-wave mixing gain coefficient , diffraction efficientcy , response time , response rate , effective trap density for the investigated photorefractive composites based on mesophase photoconductive polymers in reflection grating geometry .
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