Dynamic Aberrations Correction in an ICF Laser System

Abstract

The wavefront aberrations in inertial confinement fusion (ICF) laser system consists of static aberration such as material inhomogeneous, optical figure error and assemble error and so on, and dynamics aberration such as pumping in- duced thermal distortion, nonlinear effect induced index fluctuation and so on. Two Years ago, an adaptive optical system with 45 correction elements was established for the wavefront control of ICF laser system. And the static aberration correction had been realized. Recently this adaptive optical system has been used to correct the lamp pumping induced thermal distortion. For the nanosecond scale pulse laser output, the directly close-loop operation of adaptive optical system is impossible. So the pre-correction method of the wavefront control has been adopted. The dynamic thermal distortion pre-correction has been realized. The system also successfully corrected the compound aberration both of static and thermal aberration. This work would be helpful for shortening the operation period of the ICF laser system.