设计了一个激光光斑实时监测与光路自动准直装置,能够实时监测激光光斑并自动准直激光输出方向。基于透镜成像原理,使用CCD探测器获得光斑的二维成像,并根据两点确定一条直线原理和使用压电陶瓷电动调整架实现光路自动准直; 监测控制程序采用虚拟仪器开发软件Lab View编写,可以实时监测激光光斑模式与光斑位置抖动情况,并进行反馈控制。经测试,设计装置的调整精度达0.5 μrad,反馈控制频率约1 Hz,完全可降低或消除抖动周期在1 s以上的光斑飘移。

A new device is developed for real-time monitoring of laser beam quality and adaptive collimating of laser beam direction. Based on lens imaging principle, the device is composed of one CCD camera for two-dimensional imaging of laser spot and two piezoelectrically drived mirrors to correct laser beam shift by the principle of two points exactly defining a line in space. The adaptive control is performed through a home-made computer program using Lab View software. The system can collimate the beam direction in a resolution of 0.5 μrad and 1 Hz adjusting frequency, and correct the laser spot shift of period above 1 s.