光束指向稳定性高精度检测方法研究北大核心CSCD

光束指向稳定性是高能激光应用研究中的一项关键指标,光束指向稳定性的检测是高能激光系统性能实现的重要环节。以长焦距聚焦反射镜与高分辨率CCD(charge coupled device)为主要元件,构建高精度的光束指向检测装置。采用灰度重心法定位光斑中心,并以理想光斑与实测光斑为例进行验证,误差小于1个像元。利用CCD高频采样,统计单位时间内光斑中心位移,获得光束指向稳定性指标,检测实例精度可达1.25μrad。该方法简便易行,测量精度高,适用于各种波长的激光光束指向检测以及其他相关参数的测量。

High precision measurement method of laser beam pointing stability

The laser beam pointing stability is a key index in the application research of high energy laser. The measurement of laser beam pointing stability is an important part of the performance realization of high energy laser system. A high-precision laser beam pointing measurement device was constructed with a long-focal focusing mirror and a high-resolution charge coupled device (CCD) as the main components. The gray centroid method was used to locate the center of the laser spot, the center location of the ideal laser spot and the real laser spot was verified, and the error was less than 1 pixel. The CCD high frequency sampling was used to count the center displacement of the laser spot in unit time, so as to obtain the index of laser beam pointing stability. The accuracy of measurement examples can reach to 1.25 μrad. The proposed method is simple and feasible, and has high measurement accuracy, which is suitable for laser beam pointing measurement of various wavelengths and for measurement of other related parameters.