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由声光偏转器件(AOD)和四像限探测器(QD)组成的闭环光束跟瞄系统与以往的快速反射镜(FSM)和四像限探测器组成的跟瞄系统相比,具有带宽高、功耗低、重量轻、体积小、重复性好和控制简单可靠等优点。然而,随着控制光束偏转的超声波频率变化的加快,单声光偏转器件(SAOD)的空间分辨点数会随之下降,影响光束控制的精度。提出了一种新型的快速、非机械、高精度光束偏转方法,采用二级声光偏转器件(DAOD)进行光束控制,与一级声光控制器相比具有更快的光束控制速度,更高的空间分辨点数和更宽的扫描范围,可以显著提高光束跟踪的速度和精度。同时还提出了一种求静态和动态分辨点数的方法,并与实验数据进行了比较、分析。
A closed-loop beam tracking system consisting of an AOD and a QD has a higher bandwidth than previous tracking systems consisting of a fast-reflecting mirror (FSM) and a four-quadrant detector , Low power consumption, light weight, small size, good repeatability and simple and reliable control. However, as the frequency of the ultrasonic wave that controls the deflection of the light beam accelerates, the number of spatially resolved points of the single-light-deflecting device (SAOD) decreases, which affects the accuracy of the light beam control. A new type of fast, non-mechanical and high-precision beam deflection method is proposed, which uses two-stage acousto-optic deflecting device (DAOD) for beam control. Compared with the first stage acousto-optic controller, it has faster beam control speed and higher The spatial resolution of the points and a wider scan range, can significantly improve the speed and accuracy of beam tracking. At the same time, a method of seeking points statically and dynamically is proposed and compared with the experimental data.