在远距离相干测量系统中，分布反馈式半导体激光器（DFB-LD）以其直接高速调制特性、低成本、可批量生产等优势成为精密遥测系统的核心光源，因此对DFB-LD的窄线宽和短时频率稳定性提出了更高的要求。为了实现DFB-LD的频率稳定，通过边频锁定与光电反馈回路的方法将激光频率锁定在H¹³C¹⁴N气体吸收谱线1548.956 nm的一侧。将光电探测模块、后续误差信号生成与处理模块和激光器驱动模块集成在一块模拟电路板上，从而有效地降低了系统的噪声；使用除法器代替减法器来产生鉴频信号，大大提高了系统灵敏度和稳频精度；通过这两项技术的改进，将DFB-LD的秒级频率稳定度提高了两个数量级，从稳频前的秒级频率稳定度3.67 × 10⁻⁸提高到稳频后的秒级频率稳定度2.34×10⁻¹⁰。实验结果表明，该DFB-LD稳频方案具有高的稳频精度，且系统结构简单、体积小、可批量生产，适合于无人机机载应用场景，是远距离相干测量系统的理想光源。

A new architecture, naked-eye ghost imaging via photoelectric feedback, is developed that avoids computer algorithm processing. Instead, the proposed scheme uses a photoelectric feedback loop to first realize the correlation (multiplication) process of the traditional ghost imaging system. Then, the vision persistence effect of the naked eye is exploited to implement the integral process and to generate negative images. Two kinds of feedback circuits, the digital circuit and the analog circuit, are presented that can achieve a feedback operation. Based on this design, high-contrast real-time imaging of moving objects is obtained via a special pattern-scanning architecture on a low-speed light-modulation mask.