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Second-order NLO characteristics of thin films based on model epoxy amine oligomers with 4-amino-4'-nitroazobenzene chromophore in the main chain, containing hydroxyl and methacryloyl groups, CFAO and CFMAO, respectively, are determined. Synthesized polymers possess high content of chromophore fragments and have good film-forming properties, which allowed one to cast homogeneous films of 200-400 nm thickness. The presence of reactive groups in the monomer units makes it possible to use cross-linking of polymer matrix to preserve the chromophores orientation order achieved in the course of corona poling and to provide relaxation stability of the second-order NLO response. Rather high values of the nonlinear optical coefficients estimated by second harmonic generation technique allow one to consider these epoxy amine polymers as promising candidates for the construction of cross-linked polymer matrices with long-term stability of the quadratic NLO response at elevated temperatures.

It was found out, that in optically addressed liquid crystal spatial light modulator with the nematic liquid crystal and photoconductor, comprised by p-i-n diode on the base of amorphous hydrogenated silicon, it is possible to record the dynamic diffraction gratings with diffraction efficiency over 50%. The gratings were recorded with the use of S- effect. Possible reasons of the discovered effect are considered in the paper.© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Spatial light modulator using an amorphous silicon semiconductor in a p-i-n diode configuration are fabricated with nematic liquid crystal. The performance characteristics of the device was measured for two cases: for continuous write light and for pulse write light.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Spatial light modulators using an amorphous silicon semiconductor and p-i-n diode configuration are fabricated with nematic liquid crystal. The performance characteristics of the devices are compared.