高功率激光装置光束准直系统新型远场监测技术

利用高功率激光装置空间滤波器小孔成像和取样光栅的衍射，设计出一套新型光路远场监测方案，并且在实验平台上进行了实验验证.实验结果表明：相对传统的远场监测方法，该远场监测系统通过侧面离轴光栅取样灵活利用空间，其调整平均误差为空间滤波器小孔直径0.9%，能够满足准直系统远场调整精度(<小孔直径5%)的要求.关键词：激光技术光束准直光栅远场

New far-field detection technique for beam alignment system in high power laser facility

The laser beam automatic alignment system is applied to a high power laser facility for inertial confinement fusion. The far-field detection is a key technique of the automatic alignment system. Utilizing the image of spatial filter's pinhole of the high power laser system and diffraction of sampling grating, a new method for far-field detection of laser beam is proposed and fully demonstrated on the experimental system. The experimental results indicate that, unlike the traditional method, this far-field detection system can fully use the space through off-axial grating sampling, and the average far-field alignment error is less than 0.9% of spatial filter pinhole diameter, which meets the alignment system requirements of less than 5% of spatial filter pinhole diameter.