基于空间光调制器的双目标同步光束跟瞄系统  

Synchronous Beam Tracking and Aiming System for Double⁃Target Based on Spatial Light Modulator

作　　者：孙婉晴 王子雄 于晋龙 江阳 Sun Wanqing;Wang Zixiong;Yu Jinlong;Jiang yang(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;College of Physics,Guizhou University,Guiyang 550025,Guizhou,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]贵州大学物理学院,贵州贵阳550025

出　　处：《中国激光》2023年第5期83-92,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(61835003)。

摘　　要：传统的光束偏转技术由机械装置实现,然而机械装置具有机械惯性,会导致光束抖动。基于液晶空间光调制器(LCSLM)的新型光束偏转技术不仅能够克服机械惯性的缺陷,而且能够实现单光束输入、多光束输出,无需使用多个装置即可同时控制多光束偏转。为了实现多目标的光束跟瞄,本团队提出了一种基于多光束生成方法的多目标同步跟踪和瞄准方案,该方案将相机作为位置探测器,并使用LCSLM偏转光束对目标进行跟瞄。此外,本团队设计并搭建了双目标的同步光束跟踪和瞄准实验系统,当目标分别以2、3、4、5 mm/s的速度移动时,光束跟瞄的测量均方根误差分别为2.7045、5.6014、8.3823、11.9011μrad。此双目标跟瞄系统有望应用于激光通信网络的双光束跟踪中。Objective Acquisition,tracking,and pointing(ATP)technology is a core technology for establishing stable physical links in the field of laser communications.Research on ATP technology focuses on beam deflection.Traditional beam deflection techniques are typically implemented using mechanical devices such as gimbals and mechanical mirrors.However,mechanical devices have the disadvantages of large mass,high energy consumption,and mechanical inertia that result in a slow response to beam deflection and unstable beam control.Therefore,new nonmechanical beam deflection devices have been widely used in recent years,such as acoustooptic modulators,electrooptic modulators,and liquid crystal spatial light modulators(LCSLMs).LCSLMs can overcome the defects of mechanical inertia;therefore,they are widely used for beam tracking.In addition,LCSLMs can overcome the defects of traditional mechanical beam deflection techniques,which require multiple devices to achieve multibeam deflection.The deflection direction of multiple beams can be simultaneously controlled using a single LCSLM.The methods for generating multibeams based on the LCSLM mainly include the composite phase,subaperture,and iterative Fourier transform(IFT)methods.Currently,doubletarget tracking can be achieved using the spatial polarization division method that employs a polarizing beam splitter to generate two beams with perpendicular polarization directions to track two targets.However,this method requires two LCSLMs.To use a single LCSLM to deflect multiple beams for synchronously tracking multiple targets,a scheme of synchronous beam tracking and aiming for multiple targets is proposed by combining LCSLMbased beam tracking technology and the multibeam generation method.This scheme is expected to be applicable to the multibeam tracking mechanism of laser communication networks.We also construct an experimental system of synchronous beam tracking for doubletarget that can communicate with two mobile target terminals.Methods In this experiment,a camera was employ

关 键 词：光学器件 空间光调制器 衍射光栅 相位调制 多光束生成 运动估计 目标跟踪 

分 类 号：O436[机械工程—光学工程]