基于四象限探测器的监视对准实验

Alignment Experimental Analysis based on Four Quadrant Detector

激光束的空间稳定性是激光系统非常重要的指标,要保持激光束的空间稳定性就必须先对激光束的指向进行监测。本文采用四象限设备作为532nm半导体激光指向的监测设备,它可以快速响应光斑的中心位置。实验测量了激光束自身的漂移抖动量,然后利用转台和透镜组合标定了3个角度的指向误差。实验结果表明,激光束的漂移抖动最大值为3.6″,指向的综合误差平均在6″左右。本实验结果可以为后续加入快速反射镜的指向稳定系统提供必要的数据支持。

Spatial stability is an important property of laser beam for laser systems. Before maintaining the pointing stability, the direction of laser beam must be monitored. The four quadrant detector as pointing monitor device was used for 532 nm semiconductor laser, which could obtain the center position of laser spot quickly. In the experiment, the amount of shift and jitter for laser beam was measured. Then the combination of rotating stage and lens was used to measure the alignment error for three angles. The results show that the top amount of shift and jitter is 3.6＂, and the average of combined pointing error is around 6＂. These data can provide the support for the spatial stability system which needs feedback system with fast steering mirrors.