为了测量超长焦距高功率激光系统的波前畸变，研制并校准了基于空间相位调制的径向剪切干涉仪。仪器采用多波长设计，满足可见光和红外探测的需要。为研制并校准径向干涉仪，同哈特曼夏克(HS)传感器、Zygo干涉仪进行了对比实验。通过实验与理论对比，得到径向剪切干涉仪参数的最佳值。研究了汉宁窗的取值范围和边缘截取值的合理范围，结果表明，校准后的径向剪切干涉仪能够准确测量，仪器的重复性和精度都能满足高精度波前探测要求。

To measure the wavefront of high-power laser with ultra-long focal length, we develop and calibrate a shearing interferometer based on spatial phase modulation. It is experimentally compared with Hartmann-Shack (HS) wavefront sensor and Zygo interferometer. The results show that the shearing interferometer can meet the requirements of precisely measuring wavefront. It has high precision and good repetitiveness.