We present a preliminary experimental demonstration of an acousto-optic frequency shifted (AOFS) comb laser-based micro-Doppler detection system for moving object identification. The AOFS comb laser was constructed by successively frequency shifting a single-frequency seed laser at 1063.8 nm using an acousto-optic modulator in an amplified fiber loop, which resulted in a stable pulse output with a pulse repetition rate around 150 MHz and pulse duration of about 200 ps. The AOFS comb pulse was amplified and then directed through a fiber circulator first and then an optical lens onto a moving object, which featured both linear translation and rotation. The micro-Doppler signal of the rotation was derived from the heterodyne detection of the pulse echo comb laser and the continuous-wave single-frequency local laser. It is believed that such an AOFS comb laser-based sensing system is of great potential for micro-Doppler detection of high-speed targets owing to its long-term stability and compactness.

中文翻译：

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基于声光频移梳状激光的微多普勒检测运动目标识别

我们提出了一个基于声光频移 (AOFS) 梳状激光的微多普勒检测系统的初步实验演示，用于运动物体识别。AOFS 梳状激光器是通过在放大光纤环路中使用声光调制器在 1063.8 nm 处连续频移单频种子激光器来构建的，从而产生稳定的脉冲输出，脉冲重复率约为 150 MHz，脉冲持续时间为约 200 ps。AOFS 梳状脉冲被放大，然后首先通过光纤循环器，然后通过光学透镜引导到移动物体上，该物体具有线性平移和旋转功能。旋转的微多普勒信号来源于脉冲回波梳状激光器和连续波单频局域激光器的外差检测。