Study of the static wavefront distortion of optics elements in the multipass amplification system

Through the study of the effect of the static wavefront distortion of optics elements in the multipass amplification system, the phase RMS gradient meeting the demand of the focusing is given, which is about 0.007λ/cm. The maximum phase error value of the optics elements that the system allowed is also shown. And the addinglaws of wavefront phase by the laser beam transmission program is also checkd. As the result, this paper provides some references for the study of Shenguang facility about the elements demands.