光学传感检测技术因具有精度高、低延时和可成像等优势而得到广泛应用。随着大数据和物联网等信息技术的迅速发展，对检测平台小型化和便携性的需求日益迫切。为了克服现有技术对大型专用设备的依赖，提高对现场快检、轻载荷平台等应用场景的适用性，近年来，基于微纳光学的片上集成光学传感检测技术受到了极大关注。通过集成光源、光学传感单元与光电探测单元、以及发展片上光色散等技术，可以有效地实现光学传感信号提取和光电信号转换的片上集成，从而实现系统的微型化和多功能集成。文中介绍了相关技术原理和技术发展现状，分析了现有技术的优缺点，讨论并总结了未来的发展方向和应用前景。

The electric field distribution in LiNbO3 crystal under different electrode shape is presented by using the digital holographic interferometry. Three configurations of phase modulator including the rectangular electrode type, single-triangle electrode type, and dual-triangle electrode type are performed in this experiment. The nonuniform electric field distribution in these phase modulators are observed and the electric field increases with voltage increasing. The digital holographic interferometry with high electro-optic effect improves the measurement precision. The digital holographic interferometry provides an effective way for studying the electric field distribution. Such in situ quantitative analysis of electric field distribution is a key to optimizing electrode shape.

We present a tabletop-scale spotlight-mode down-looking synthetic aperture imaging ladar (DL SAIL) demonstrator, which is performed by a collimator with 10 m focal length to simulate the far-field optical field. A specular-point target and a diffuse-reflection target have been used for resolution analysis and 2D imaging, respectively. The experimental result is in agreement with the theoretical design. The experiment setup is capable of simulating a real application scenario for further study. This Letter is focused on the proposition and implementation of spotlight-mode DL SAIL.