一种基于光学相控阵技术的可变焦液晶透镜实现方法  

A Liquid Crystal Lens with Tunable Focal Length Based on Principle of Optical Phased Array Technology

作　　者：肖锋[1] 孔令讲[1] 艾越[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731

出　　处：《光学学报》2012年第F12期286-291,共6页Acta Optica Sinica

基　　金：国家自然科学基金（61178068）资助课题.

摘　　要：基于光学相控阵理论，与液晶材料的电光特性相结合，提出了一种可变焦液晶透镜的实现方法以及控制过程。在理论分析相控阵液晶透镜可实现性的基础上，设计制作了电极数为1920，孔径宽度9．6mm，电极占空比为0．8的液晶透镜，其驱动电压为5V，每根电极独立可控，且能实现201级交流电压控制。通过计算机仿真了该液晶透镜产生的相位延迟分布，分析比较了其在焦点处形成的光斑形状大小与普通透镜的光斑形状大小之间的误差，证明了该液晶透镜能控制焦距在0．4～10m的范围内连读变化。实验观测了液晶透镜对激光束发散度的控制，验证了其可以实现焦距可调变化。An implementation method of tunable liquid crystal lens is proposed based on the principle of optical phased array technology and the electro-optic characteristic of the liquid crystal. Theoretical analysis of the feasibility is made and a liquid lens is fabricated. The device has 1920 electrodes, 9.6 mm aperture size and 0.8 filling ratio. It is driven by a voltage of 5 V and each electrode can be controlled independently by 201-level AC square-wave voltage. Simulation has been made to produce the phase delay distribution. Relative error of the spot size at the focus between the liquid crystal lens and the conventional lens has been analyzed which demonstrates that the liquid lens can vary the focal length between 0.4 m to 10 m continuously. Experiment has also been done to verify that the liquid lens has the capacity to control the divergence of an incident light and to realize funable focal length by varying the focal length.

关 键 词：光学器件 液晶透镜 光学相控阵 可变焦距 

分 类 号：O436.1[机械工程—光学工程]