Abstract
A self-phase modulation that originated in photothermal effects in host-guest liquid crystals (HGLCs) with three kinds of nematic-isotropic transition temperatures (TNI) was characterized by investigating both the experimental diffraction beam pattern and theoretical one. The experimental diffraction patterns were in good agreement with the calculated results using Kirchhoff's diffraction integral in the case of the Gaussian-type phase distribution. The diffraction patterns depended on the polarization direction of the incident He–Ne laser and the results were explained by the strong anisotropy of HGLCs. Higher photosensitivity caused by the large temperature dispersion of refractive index was obtained in low TNI of HGLCs than in high TNI of HGLCs.
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