Optically induced molecular reorientation and third-order nonlinear optical processes in nematic liquid crystals

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We report some quantitative studies of four-wave mixing in aligned nematic-liquid-crystal films. Using an unfocused cw laser of 200 mW power, at an estimated intensity of 5 W/cm2, we have observed a conversion efficiency of 10-2. The third-order nonlinear polarization that is responsible for this wave-mixing process is attributed to the optically induced molecular reorientation. A quantitative calculation of the wave-mixing efficiency and the intensity dependence is presented. It is shown that the experimental results are in good agreement with the theoretical predictions.

Original languageEnglish (US)
Pages (from-to)2077-2081
Number of pages5
JournalPhysical Review A
Issue number4
Publication statusPublished - Jan 1 1981


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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