基于液晶光学相控阵的光束扫描研究进展
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摘要
在空间激光通信领域中,APT(捕获、瞄准、跟踪)技术是核心技术之一,是建立可靠通信链路的重要保证。传统APT技术一般采用机械式转动来实现转向控制,存在体积大、转动惯量大、功耗高等缺点,无法满足空间激光通信轻小化、低功耗等实际要求,因此对非机械式光束扫描技术的研究具有重要意义。与传统APT技术相比,光学相控阵技术具有高扫描精度、随机偏转、稳定性好等优点,是目前非常有潜力的非机械式光束扫描技术之一,其中基于液晶材料的光学相控阵技术发展迅速。简要介绍了光学相控阵用于光束扫描的基本原理,综述了基于液晶材料的光学相控阵研究现状,分析了液晶光学相控阵用于光束扫描过程中的响应速度、偏转效率和偏转精度这3大关键性能指标以及影响因素,对提高关键性能的途径作了简要总结。
The acquisition,pointing,and tracking(APT)technology is important to establish the reliable links in space laser communication.The conventional APT technology employs a mechanical rotation method to achieve steering control.In addition,the conventional APT technology exhibits some significant disadvantages,including large volume and rotational inertia as well as high power consumption.Further,the classical APT technology cannot satisfy the practical requirements of space laser communication,i.e.,light weight,miniaturization,and low power consumption.Therefore,to study the non-mechanical beam scanning technology is of considerable significance.When compared with the conventional APT technology,an optical phased array is a promising nonmechanical beam scanning technique because it provides various advantages,including high scanning accuracy,random deflection,and strong stability.The liquid crystal optical phased array(LCOPA)is observed to develop rapidly.In this study,we briefly introduce the basic principle of an optical phased array for beam scanning.Subsequently,we review the status of current research about LCOPAs.Further,three key performance indicators,i.e.,response time,deflection efficiency,and deflection accuracy,as well as the influence factors are analyzed.In addition,the methods used to improve the LCOPA performances are also summarized.
The acquisition,pointing,and tracking(APT)technology is important to establish the reliable links in space laser communication.The conventional APT technology employs a mechanical rotation method to achieve steering control.In addition,the conventional APT technology exhibits some significant disadvantages,including large volume and rotational inertia as well as high power consumption.Further,the classical APT technology cannot satisfy the practical requirements of space laser communication,i.e.,light weight,miniaturization,and low power consumption.Therefore,to study the non-mechanical beam scanning technology is of considerable significance.When compared with the conventional APT technology,an optical phased array is a promising nonmechanical beam scanning technique because it provides various advantages,including high scanning accuracy,random deflection,and strong stability.The liquid crystal optical phased array(LCOPA)is observed to develop rapidly.In this study,we briefly introduce the basic principle of an optical phased array for beam scanning.Subsequently,we review the status of current research about LCOPAs.Further,three key performance indicators,i.e.,response time,deflection efficiency,and deflection accuracy,as well as the influence factors are analyzed.In addition,the methods used to improve the LCOPA performances are also summarized.
引文
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