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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1990),
  • paper QWD19

Thermal grating with threshold in polymer dispersed liquid crystals

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Abstract

In a recent paper1 we showed the nonlinear optical behavior of the thermal origin in dye doped polymer dispersed liquid crystals (PDLCs). These materials contain nematic microdroplets in a polymeric matrix. Therefore, they produce a strong light scattering which depends on the difference between the refractive indices of the nematic droplets and the polymer. Furthermore, in a dye doped sample the light absorption produces thermal indexing. A strong change in the transmission occurs when the liquid crystal droplets become isotropic, thus approaching the refractive index of the polymeric matrix: in this way an effect of self-transparency can be observed. Here we report measurements concerning the degenerate wave mixing phenomenon which occurs between a pump and signal beam after the onset of transparency in a PDLC sample.

© 1990 Optical Society of America

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