Proof deformable mirror face solution at cavity mirror in four-pass amplifier system

Based on the experience of adaptive optics application in high power laser systems, a deformable mirror located at cavity mirror can largely improve the dynamic range of correction aberrations. The four-pass amplifier laser facility has two features different from other facilities. The beam size has an alteration and beam rolls an angle of 90° between 1~2 pass and 3~4 pass propagation. The solution existence of deformable mirror face at this four-pass amplify facility cavity mirror is proved. How the ratio of beam alteration to affect the face solving problem of deformable mirror is analyzed by numerical simulation.