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1 Opto-Electronics Review

1 2002

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Influence of light on self-diffraction process il liquid crystal cells with photoconducting polymeric layers

Myśliwiec J., Miniewicz A., Bartkiewicz S.

Opto-Electronics Review

2002

Vol. 10, No. 1

53-58

In this paper we present experimental results on the influence of an external light on phase grating recording process in nematic liquid crystal cell with a photoconducting polymeric layer (PVK doped with TNF). Depending on voltage applied to the cell, the external light can amplify or attenuate the diffracted, into first order light power measured in degenerate two-wave mixing experiment. From the time delay between the opening of the external light and the moment of diffraction signal change, we deduce information about the effective charge carriers mobilities in PVK : TNF polymeric layer. We also discuss and present simple explanation of the observed effect.