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Abstract
In a previous paper [1] we suggested that, in a cholesteric liquid crystal undergoing a step-like d.c. electric field applied parallel to the helical axis, the behavior of the relative variation of the maximum intensity wavelength of the Bragg-reflected light is related to two different relaxation phenomena. In this paper we present the time behavior of the relative variation of the maximum intensity wavelength of the Bragg-reflected light for different sample thicknesses. Moreover, the disagreement between the experimental behavior of relaxation times vs E and theoretical one (τ - 1/E2) can be related to an increase of the medium apparent viscosity which is due to the increase of dislocation density with the external applied field.