Study of self-diffraction phenomenon in hybrid liquid crystal panel

In this paper we present the results of dynamics of hologram generation in hybrid nematic liquid crystal panels with photoconducting layers (made of poly- N -vinyl-carbazole doped with 2,4,7-tri-nitrofluorenone) for different applied voltages. During experiments we have measured the temporal changes in the diffraction efficiency coefficient. To reach the equilibrium between all writing processes we have used the 'long pulse method' to generate holograms. This method exhibited the insufficiency of earlier presented refractive index time dependence and a new model had to be proposed. We assumed the existence of charge traps in photoconducting layers which results in additional erasing functions in particular refractive index time dependence. Comparison of the newly proposed mathematical model and the experimental results has shown very good agreement.