Abstract
We report on an experimental investigation of the non-linear polarization effect in guest-host nematic liquid crystals (GH-NLCs) with uniaxial alignment. The degree of polarization of a laser beam transmitting the GH-NLCs and an aperture behind them is strongly dependent on the incident beam intensity. The mechanism is discussed on the basis of the laser-induced photothermal self-phase modulation. The origin of the effect is a strong anisotropy of the intensity-induced change or refractive indices.
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