液晶多波束光学相控阵技术

Multi-beam optical phased array technology based on liquid crystal

为了适应无线激光通信技术发展对小型化、非机械式光束扫描设备的要求,研究了液晶多波束光学相控阵技术。首先利用角谱理论推导了光学相控阵光束偏转原理,然后搭建了基于液晶空间光调制器的相控阵光束扫描系统,实现了θ=0～2.8947°、φ=0～360°的二维光束偏转,最后采用部分孔径法实现了多波束控制。验证了液晶空间光调制器用于多波束光学相控阵的可行性。

To satisfy the requirements of miniaturization laser communication systems and the requirements of non mechanical beam scanning equipment, the liquid crystal（LC） based on multi-beam optical phased array（OPA） was investigated. The principle of LCOPA beam steering was deduced by using angular spectrum method. The beam scanning experimental system was established using a LC spatial light modulator, which was capable of two-dimensional beam steering from 0°～2.8947°and from 0°～360°in the zenith and azimuth direction, respectively. Finally, the partial aperture method is used to realize the multi-beam control.Results demonstrated the feasibility of the multi-beam OPA technology that employs LCs.