【摘要】 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。更多还原

【Abstract】 Liquid crystal spatial light modulator(LCSLM) can realize beam steering by modulating wavefront tilt.Compared with fast steering mirror(FSM),LCSLM is smaller,lighter and lower power consumptive in a non-mechanical way.Thus,it can be applied as a beam steering control device in laser communication.The principle of liquid crystal beam steering is introduced.A close-loop control experiment is designed based on LCSLM to realize beam steering according to the modulation characteristic of LCSLM tested.The experimental results show that LCSLM can suppress jitter effectively.The relative error is less than ±1.75%.The influence of diffractive effect on beam quality is analyzed,as well as the restriction of response time of liquid crystal,transmission delay and algorithm complexity on control bandwidth.更多还原