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提出并设计了一个采用液晶空间光调制器(LCSLM)作为光束动态偏转器件的无机械光束扫描系统,实现了光束的方向和强度的可编程控制,解决了远场任意图形的激光光束动态逼近问题。逼近方法采用纯相位调制技术和傅里叶迭代优化算法结合的衍射图形相位优化设计方法。介绍了点阵图形发生原理并给出实验装置图。实验结果显示,用该方法产生的二维阵列式光束,其光斑强度偏差度小于8%,图形发生响应时间小于100 ms,该实验结果能够满足多光束准确动态偏转的要求。该系统具有精确、响应快、无机械惰性等特点,在激光寻的、制导以及多目标威胁预警和反击中有着重要的研究价值。
A mechanical beam scanning system using liquid crystal spatial light modulator (LCSLM) as the beam dynamic deflection device is proposed and designed, which realizes the programmable control of the beam direction and intensity and solves the problem of the dynamic beam approximation . The approximation method uses phase-modulation technique and Fourier iterative optimization algorithm to optimize the design phase of diffraction pattern. The principle of dot pattern generation is introduced and the experimental setup is given. The experimental results show that the two-dimensional array beam generated by this method has less than 8% spot intensity deviation and less than 100 ms response time. The experimental results can meet the requirements of multi-beam accurate dynamic deflection. The system is accurate, fast response, no mechanical inertia and so on. It has important research value in laser seeking, guidance and multi-target threat warning and counterattack.