在高功率激光系统,激光束小尺度相位畸变波前探测是实现激光束中频段波前补偿与控制的重要前提.采用阵列菲涅耳波带片作为激光束波前传感的子孔径分割器,利用区域重构的Southwell模型进行波前重构.并针对波前传感器子孔径数目、小尺度相位畸变波前的参数对波前重构精度影响进行分析与模拟计算,给出了阵列菲涅耳波带片合理的子孔径数目,为20×20～30×30;对小尺度相位畸变,激光束波前的重构误差小于十分之一波长.

In high power laser system,a small size phase-distortion wavefront measure is necessary to compensate and control the wavefront of laser beam with intermediate frequency. Array Fresnel zone plates splitting wavefront and the Southwell model of zonal wavefront reconstruction arithmetic are presented,the effect of the sub-apertures of wavefront sensor and variation range of distorted phase on wavefront reconstruction are analyzed in detail,and a suitable number 20×20～30×30 of array Fresnel zone plates is given. Simulation results show the error of wavefront reconstruction with this method is small than one-tenth wavelength.