为适应高功率激光系统的紧凑空间需求，将基于二阶鬼像的远近光场耦合方案应用于高功率激光准直技术中，设计并搭建出灵敏的小型准直光学系统。提出完备的测试方案，验证了该方案的可行性，获得近场测量灵敏度为7.04 μm/pixel，远场测量灵敏度为18.14 (″)/pixel，并得到远场变化对近场的影响关系，用以优化光束校准。相比于传统远、近场分离的准直系统，该方案在满足成像质量和分辨率要求的同时，大幅缩减了光路和器件数量，远、近光场相互影响和校准的反馈处理更便捷。

To adapt to compact space requirements of high power laser system, a far-field and near-field coupling scheme based on second order ghost image is used in high power laser collimation technology. A sensitive small-size collimation optical system is designed and built. We present complete test scheme and verify its feasibility. The near-field measurement sensitivity is 7.04 μm/pixel and the far-field measurement sensitivity is about 18.14 (″)/pixel. The influence of far-field change on near-field is researched and used to optimize beam collimation. Compared with traditional collimation system of far- and near-field separation, this scheme sharply reduces the number of light paths and devices under the condition of imaging quality and resolution assured. It is more convenient to feedback the interaction effect and collimation of far-field and near-field.