向列型液晶中的光自聚焦和自散焦

Self- focns and Self-defocus in Nematic Liquid Crystals

从理论上推出:分子半行液晶膜面排列的向列型液晶由于光致重取向产生的折射率随光强增大而减小的结果将导致高斯光束的自散焦。而对于垂直膜面排列的液晶分子重取向则导致相反的结果,实验证实了这一理论结果。

It is shown theoretically that .due to, optical reorieatation of molecules in Hematic liquid crystal of planar alignment the refractive index of the liquid crystal will reduce with increasing incident intensity and then leads to self-defocusing of a Gaussian beam. For optical reorieatatioa of molecules in Home tropically aligned nematics, the opposite results will be expected. The experimental data confirm this theoretical results.