强激光畸变波前的高精度重构

 高精度的波前重构，是实现对强激光波前畸变进行有效补偿与控制，提高光束质量的重要前提。先利用三个较远的衍射面及输入面上的强度信息，重构出强激光波前的以均方根梯度来描述的低频成分；再利用两个较近的衍射面及输入面上的强度信息，重构出强激光波前的以随机分布描述的中高频成分。当波前畸变的低频幅度小于或等于2λ，中高频幅度小于或等于0.15λ时，算法具有良好的收敛性能。

High precision reconstruction of distorted wavefront in high power laser system

High precision wavefront reconstruction is very important for effective compensation, control and quality improvement of high power laser beam. The low and the middle and high frequency components of the distorted wavefront in the high power laser system can be described by use of RMS gradient and uniform random distribution respectively. First the intensity distributions on the input plane and other three faraway diffraction planes are used to iteratively reconstruct the low frequency component of the distorted wavefront in the high power laser system, and then the intensity distributions on the input plane and two near by diffraction planes are applied to iteratively reconstruct the middle and high frequency component. This algorithm shows good convergence when the reconstructed amplitudes of the low and the middle and high frequency component are not higher than 22 and 0. 152, respectively.