Closed-loop beam quality control for MOPA solid slab laser

This paper introduces the beam characteristics of the MOPA slab laser system, including near-field intensity distribution, spatial character and temporal frequency of wavefront distortion. The deformable mirror with large dynamic range and high spatial resolution was developed. The adaptive optics closed-loop correction system was designed to complete the closed-loop control of the whole propagation process of high power beams. The value of of beam quality has been improved from 7.4 to 4.06. According to the residual error of the closed-loop wavefront correction, the beam quality of the MOPA might be further improved.