为了从实验上分析和验证H-S传感器测量M2因子方法, 对使用双曲线拟合法测量M2因子和H-S传感器测量M2因子做了详细的实验研究, 且对实验结果、实验误差进行了比较与分析。研究表明: 当H-S波前传感器透镜组足够多, 重构误差较小, 选取合适的泽尼克多项式阶数时, H-S波前传感器一次测量法得到的光束的M2因子与传统方法测得的M2因子值基本相当。与双曲线拟合法相比, H-S传感器法适用范围小, 但是当满足测量条件时, H-S传感器法更便捷。

The measurement methods of M2 factor using hyperbolic fit and Hartmann-Shack sensor are studied experimentally. The results and experimental errors are compared and analyzed. It is shown that the measured M2 factor is approximately consistent using the two methods when the Hartmann-Shack wavefront sensor contains enough lenslet array, the reconstruction error is small and the orders of the Zernike polynomial is suitably chosen. Compared with the method using hyperbolic fit, the methods using Hartmann-Shack sensor has small scope of application. However, the method using Hartmann-Shack sensor is more simple when it contents the working condition.