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Influence of External Electric Field on Time of Nonlinear Optical Reorientational Effect in Nematics

100%
Bajdecki W., Karpierz M.
Acta Physica Polonica A
|
2003
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vol. 103
|
issue 2-3
187-193
EN
Nonlinear reorientation phenomena in nematic liquid crystals cause extremely large refractive index changes. However, this effect is relatively slow and the determination of the time necessary to appearing or disappearing of the nonlinear effect is an important issue. In this work we present measurements of the time of increasing the nematics reorientation induced by the light beam passing through the liquid crystalline layer. The influence of external low-frequency electric field suppressing reorientation is also reported. The obtained results describing relations between time and optical power of light as well as between time and external electric field intensity are in good agreement with theory.
2
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Nonlinear Optical Measurements of Elastic Constants in Nematic Liquid Crystal

100%
Bajdecki W., Karpierz M.
|
EN
A new method of measurements of elastic constants of nematic liquid crystals by applying the nonlinear optical effect is presented. This method bases on measurements of a value of the reorientation threshold in a liquid crystal layer while the reorientation is induced by the light beam passing through the layer. The obtained results are in a qualitative compatibility with the results obtained by classical methods.
3
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Reorientational Nonlinear Phenomena in Thin Nematic Liquid Crystals Layer

81%
Brzdąkiewicz K., Bajdecki W., Kozanecka A., Karpierz M.
Acta Physica Polonica A
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2001
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vol. 99
|
issue 1
183-192
EN
In this paper the detailed study of the self-diffraction phenomena due to reorientational optical nonlinearity in nematic liquid crystalline cell is presented. The optical nonlinear effect is additionally modified by external low-frequency electric field. The dependence of nonlinear response on light polarization is also analyzed. The theoretical investigations are compared with experimental results and the theoretical predictions are in excellent agreement with experimental data.
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