一种重构高功率激光束波前的方法

介绍一种对“星光Ⅱ”１０＾１２Ｗ高功率激光器的波前相位进行重构测量的研究方法。实验中对高功率激光束经过孔阵列相位传感器在像纸上烧蚀成的光斑阵列进行图像处理，测定各光斑光强中心及相对位移，再由理论分析得到实用的迭代算法公式，重构出高功率激光束波前。

A Novel Method to Reconstruct the Wavefront of High Power Laser Beam

A novel method is presented to reconstruct the wavefront with phase distortion in STRALIGHT II 1012 W high power laser apparatus by means of computer image processing. In experiments, the image processing of optical spots fired on photograph by high power laser beams through a plate with hole array. The iteration formula group was deduced to apply in the experiments. Each center of intensitv of optical spots and relative shift were measured, and phase wavefront of high power laser was reconstructed in iteration. Computer software made the focusing procedure of small optical beams in hole array instead of which in sub-lens array of normal Hartmann-Shack sensor. The method can be used to measure directly the high power laser beam with large diameter. The principle and the formula of the reconstruction are described. The method has been used in the experiments of the high power laser apparatus STARLIGHT ⅠⅠ. The maximum diameter measured is 200 mm,and the resolving power of wavefront reconstruction is about λ/5.