利用二波耦合实验研究了C60掺杂垂直排列向列相液晶(5CB) 中全息光栅衍射信号的脉冲现象,实验发现没有相干光预照与有相干光预照的样品的衍射信号表现出不同的脉冲现象.折射率光栅瞬间增强产生的脉冲要比折射率光栅瞬间减弱时产生的脉冲显著得多.为了解释实验中观察到的这种现象,给出了液晶分子取向力矩平衡方程.
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