Simulation experiment of high energy laser propagation in the atmosphere

Simulation experiments of adaptive optics compensation to thermal blooming phase distortion induced by high energy laser propagation in the atmosphere were carried out. The results of spot pattern, centroid excursion, second moment radius and the Strehl ratio in the focal plane were obtained when the adaptive optics system was in the open or closed loop shape. The effect of adaptive optics compensation was prominent when the Bradley-Hermann distortion number was less than 300, and the Strehl ratio was more than 0.4 on the whole. Phase compensation instability appeared when the distortion number ND became greater than 300, in this case, the compensated beam Strehl ratio went down rapidly. The experimental Strehl ratio without adaptive optics compensation agreeed well with that of the thin l