Laser induced self-phase modulation in nematic liquid crystals and effects of applied dc electric field |
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Authors: | Liang Song |
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Affiliation: | Department of Physics, The Chinese University of Hong Kong, Hong Kong, P.R. China |
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Abstract: | We investigated the ring-pattern characteristic of self-phase modulation in a homeotropic nematic liquid crystal cell induced by a focused Ar-ion laser beam. Laser induced self-phase retardation versus incident angle was experimentally studied, and good agreement with theory was found. Effects of applied dc electric field on the ring-pattern were studied, to our knowledge, for the first time. When the electric field was below a critical value, laser induced self-phase retardation could be varied by changing the electric field strength. Above this value, irregular shaped diffraction pattern accompanied by intense light scattering was observed, which is attributable to honeycomb-like domain formation. |
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Keywords: | 42.70.Df 42.65.Jx 83.80.Xz |
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