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采用一次性全息曝光的方法同时在样品上制备了周期分别为1μm和4μm,衍射效率电场可调的双重复合式液晶/聚合物光栅.使用He-Ne激光器对复合光栅的衍射特性进行了实验研究,发现光栅存在两个1级衍射极强峰.对峰值衍射效率的测定结果表明,周期1μm的光栅衍射效率为90%,周期4μm的光栅,60%.结合耦合波理论计算了周期1μm和4μm光栅的衍射效率理论值,分别为92.57%和63.68%.实验结果与理论值符合得非常好.对电光特性的测试表明该复合光栅内的两套子光栅的驱动电压V90比较接近,分别为7 V/μm(周期1μm)和6 V/μm(周期4μm),从而保证了电调谐的同步性.
A one-time holographic exposure method was used to fabricate a double composite liquid crystal / polymer grating with periodic 1μm and 4μm periods and an adjustable electric field of diffraction efficiency on the samples simultaneously. The diffraction characteristics of the composite grating were investigated by using He-Ne laser The results show that the gratings have a diffraction efficiency of 90% and a grating with a period of 4μm and 60%, respectively.According to the coupled-coupled wave theory, the periodicity of 1μm and 4μm The diffraction efficiency of the grating is theoretically 92.57% and 63.68%, respectively. The experimental results are in good agreement with the theoretical results. The testing of the electro-optic properties shows that the driving voltages V90 of two sets of sub-gratings in the grating are close to 7 V / μm (period 1μm) and 6 V / μm (period 4μm), thus ensuring the synchronization of the electrical tuning.