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液晶空间光调制器(LCSLM)通过实时调制波前倾斜实现光束偏转,与传统的快反镜相比,具有非机械调制、体积小、功耗低、轻巧灵敏等优点,可应用于空间光通信中。简单介绍了液晶实现光束偏转的原理,并测试了LCSLM的调制特性,根据调制特性设计基于LCSLM的光束偏转闭环系统。实验结果表明LCSLM能有效地抑制光束抖动,使相对误差小于±1.75%。分析了LCSLM的衍射效率对于光束质量的影响及液晶响应速度、系统传输时延和算法复杂度对控制系统带宽的制约。
The liquid crystal spatial light modulator (LCSLM) realizes beam deflection by modulating the wave front tilt in real time. Compared with the conventional fast mirror, the LCSLM has the advantages of non-mechanical modulation, small size, low power consumption, light weight and sensitivity, and can be applied to space optical communications in. The principle of liquid crystal beam deflection is introduced briefly. The modulation characteristics of LCSLM are tested. The LCSLM - based beam deflection closed-loop system is designed according to the modulation characteristics. The experimental results show that LCSLM can effectively restrain the beam jitter and make the relative error less than ± 1.75%. The influence of the diffraction efficiency of LCSLM on the beam quality and the response speed of the liquid crystal, the transmission delay of the system and the complexity of the algorithm are analyzed to control the bandwidth of the control system.