制备了掺杂甲基红(质量分数1%)向列液晶薄膜样品,测量了Ar^+激光的透过率与样品厚度之间的关系,发现激光的偏振方向与液晶指向矢方向垂直时,透射率最大。选择Ar^+激光作为写入光,重点利用二波耦合实验测量了一阶衍射效率随样品厚度、入射光夹角、两束入射光光强、两束入射光光强比的变化关系,实验发现当液晶薄膜样品厚度为32μm,两束入射光夹角为2°,两束入射光光强分别为80mW/cm^2且光强比为1:1时具有最佳的全息存储实验条件。
The optimal experimental conditions of holographic storage were investigated in this experiment.The nematic liquid crystal 5CB doped with 1 % (mass fraction) methyl-red was employed and the twowave coupling method was used to measure the first order diffraction efficiency. The best conditions were observed when the sample thickness of 48μm, the angle between two incident beams of 2 °,and the two incident beams with the equal intensity of 80 mW/cm^2 were achieved at the meantime, and the laser polarization direction was perpendicular to liquid crystal director.