Abstract
Optical nonlinearity in host–guest liquid crystals was characterized by systematically investigating both the experimental diffraction beam pattern and the theoretical one originating in photothermal self-phase modulation. The experimental diffraction patterns were in very good agreement with the calculated results when the refractive index changes (Δn) were assumed to be described by the equation Δn=n2I+n4I2, where n2 and n4 are nonlinear coefficients, and I is the light intensity. These higher-order nonlinear coefficients were strongly dependent on the nematic–isotropic transition temperatures of the host–guest liquid crystals, dye concentration, and sample thickness.
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