Wavefront precompensation technology of high-energy lasers

With the development of high power laser technology, the current wavefront correction device with high power reflective deformable mirror can only avoid the damage of the reflective surface by increasing the aperture, and it is difficult to solve the problem of mirror deformation during continuous work. In this paper, a low-power deformable mirror is used to pre compensate in the signal light stage to achieve the effect of high power laser beam quality correction. First, the compensation principle and method of the high energy signal optical pre compensation technology are introduced. Then, the wavefront compensation experiment is carried out when the output power of the slab solid laser is 30w and 3000w respectively. Through the pre compensation method, the far field beam quality of the laser is significantly improved. When the output power of the laser is 30w, the beam quality is improved from β= 10 to β= 1.5； When the laser output power is 3000w, the beam quality changes from β= 10 to β= 3. In addition, the corresponding research and experiment are carried out on the signal optical transmission technology of non plane wavefront and the correction strategy of signal optical pre compensation technology. Compared with the traditional adaptive optical correction methods, the signal light pre compensation technology can fundamentally get rid of the heating and damage problems of deformable mirrors caused by intense lasers, and infinitely expand the power limit of the beam cleaning system.